#include <bits/stdc++.h> using std::vector; void init_io() { std::cin.tie(nullptr); std::ios::sync_with_stdio(false); } using Counter = int64_t; constexpr Counter INF = 1000000000000000000LL; constexpr size_t NONE_SIZE_T = std::numeric_limits<size_t>::max(); struct Instruction { Counter full = 0; Counter best = -INF; bool used = false; }; struct Program { vector<Instruction> instructions; bool first_start_only = false; explicit Program(std::istream &input); }; Program::Program(std::istream &input) { size_t num_ops; input >> num_ops; instructions.reserve((num_ops + 1)/2); Instruction current_instruction; Counter current_val = 0; bool current_instruction_exists = false; bool seen_w = false; for (size_t i=0; i<num_ops; ++i) { char op; input >> op; switch (op) { case 'W': { if (current_instruction_exists) { instructions.push_back(current_instruction); if (!seen_w) first_start_only = true; } seen_w = true; current_instruction = Instruction{}; current_val = 0; current_instruction_exists = false; } break; case 'Z': { current_instruction.best = std::max(current_instruction.best, current_val); current_instruction.full = current_val; current_instruction_exists = true; } break; case '+': { int x; input >> x; current_val -= x; } break; case '-': { int x; input >> x; current_val += x; } break; default: { assert(false); } break; } } if (current_instruction_exists) { instructions.push_back(current_instruction); if (!seen_w) first_start_only = true; } } struct EndpointProposal { size_t program_idx = NONE_SIZE_T; Counter value = -INF; }; void insert_proposal(std::array<EndpointProposal, 2> &arr, const EndpointProposal &proposal) { if (proposal.value > arr[0].value) { arr[1] = arr[0]; arr[0] = proposal; } else if (proposal.value > arr[1].value) { arr[1] = proposal; } } void erase_proposal(std::array<EndpointProposal, 2> &arr, size_t program_idx) { if (arr[1].program_idx == program_idx) { arr[1] = EndpointProposal{}; } else if (arr[0].program_idx == program_idx) { arr[0] = arr[1]; arr[1] = EndpointProposal{}; } } class System { public: explicit System(std::istream &input); Counter solve(); private: void try_individual(); void try_greedy(); void try_with_large(bool start_large, bool end_large); void find_best_proposals(std::array<EndpointProposal, 2> &start_proposals, std::array<EndpointProposal, 2> &end_proposals, EndpointProposal *&start, EndpointProposal *&end); Counter best_score = -INF; vector<Program> programs; Program *large_program = nullptr; }; System::System(std::istream &input) { size_t num_programs; input >> num_programs; programs.reserve(num_programs); for(size_t i=0; i<num_programs; ++i) { Program program(input); if (!program.instructions.empty()) { programs.push_back(std::move(program)); } } } Counter System::solve() { if (programs.empty()) return 0; try_individual(); try_greedy(); if (large_program) { for (bool start_large : {false, true}) { for (bool end_large : {false, true}) { try_with_large(start_large, end_large); } } } return best_score; } void System::try_individual() { for (const Program &program : programs) { Counter counter = 0; for (const Instruction &instruction: program.instructions) { counter += instruction.full; } best_score = std::max(best_score, counter); } } void System::find_best_proposals(std::array<EndpointProposal, 2> &start_proposals, std::array<EndpointProposal, 2> &end_proposals, EndpointProposal *&start, EndpointProposal *&end) { start = &start_proposals[0]; end = &end_proposals[0]; if (start->program_idx!=NONE_SIZE_T && end->program_idx!=NONE_SIZE_T && start->program_idx == end->program_idx && programs[start->program_idx].instructions.size() == 1) { // Can't use the same endpoint. if (start_proposals[1].value > end_proposals[1].value) { ++start; } else { ++end; } } } void System::try_greedy() { std::vector<int> used_counts(programs.size(), 0u); int total_used_count = 0; std::array<EndpointProposal, 2> start_proposals = {}; std::array<EndpointProposal, 2> end_proposals = {}; Counter score = 0; for (size_t program_idx=0; program_idx < programs.size(); ++program_idx) { Program &program = programs[program_idx]; for (Instruction &instruction: program.instructions) { instruction.used = false; if (instruction.best > 0 && !(program.first_start_only && &instruction == &program.instructions.front())) { instruction.used = true; score += instruction.best; ++used_counts[program_idx]; ++total_used_count; } } { const Instruction &instruction = program.instructions.front(); EndpointProposal proposal; proposal.program_idx = program_idx; if (instruction.used) { proposal.value = 0; } else { proposal.value = instruction.best; } insert_proposal(start_proposals, proposal); } { const Instruction &instruction = program.instructions.back(); if (!(program.first_start_only && &instruction == &program.instructions.front())) { // can use as an endpoint EndpointProposal proposal; proposal.program_idx = program_idx; if (instruction.used) { proposal.value = instruction.full - instruction.best; } else { proposal.value = instruction.full; } insert_proposal(end_proposals, proposal); } } } EndpointProposal *start; EndpointProposal *end; find_best_proposals(start_proposals, end_proposals, start, end); if (start->program_idx==NONE_SIZE_T || end->program_idx==NONE_SIZE_T) { // Impossible. return; } { score += start->value; Instruction &instruction = programs[start->program_idx].instructions.front(); if (!instruction.used) { instruction.used = true; ++used_counts[start->program_idx]; ++total_used_count; } } { score += end->value; Instruction &instruction = programs[end->program_idx].instructions.back(); if (!instruction.used) { instruction.used = true; ++used_counts[end->program_idx]; ++total_used_count; } } for (size_t program_idx = 0; program_idx < programs.size(); ++program_idx) { const int other_middle = total_used_count - used_counts[program_idx] - (start->program_idx != program_idx) - (end->program_idx != program_idx); if (used_counts[program_idx] - 1 > other_middle) { // Not enough other middle to fill the gaps. large_program = &programs[program_idx]; return; } } best_score = std::max(best_score, score); } struct LargeDecrementEntry { Counter value = -INF; size_t prev = NONE_SIZE_T; size_t next = NONE_SIZE_T; }; struct LargeDecrementEntryQueueElem { size_t idx = NONE_SIZE_T; Counter value = -INF; }; inline bool operator<(const LargeDecrementEntryQueueElem &a, const LargeDecrementEntryQueueElem &b) { return a.value < b.value; } struct AddInstructionQueueElem { size_t program_idx = NONE_SIZE_T; size_t instruction_idx = NONE_SIZE_T; Counter value = -INF; }; inline bool operator<(const AddInstructionQueueElem &a, const AddInstructionQueueElem &b) { return a.value < b.value; } void System::try_with_large(const bool start_large, const bool end_large) { if (start_large && end_large && large_program->instructions.size() == 1) return; if (!start_large && large_program->instructions.size() == 1 && large_program->first_start_only) return; int large_used_count = 0; int other_used_count = 0; Counter score = 0; // Process large program and initialize large decrement priority queue. Counter gap = -INF; vector<LargeDecrementEntry> large_decrement_entries; large_decrement_entries.reserve(large_program->instructions.size()); for (Instruction &instruction : large_program->instructions) { instruction.used = false; bool erasing_forbidden = false; Counter instruction_score = 0; if (start_large && &instruction == &large_program->instructions.front()) { instruction.used = true; erasing_forbidden = true; instruction_score = instruction.best; } else if (end_large && &instruction == &large_program->instructions.back()) { instruction.used = true; erasing_forbidden = true; instruction_score = instruction.full; } else if (&instruction == &large_program->instructions.front() && large_program->first_start_only) { // don't use } else if (instruction.best > 0) { instruction.used = true; instruction_score = instruction.best; } if (instruction.used) { ++large_used_count; score += instruction_score; if (!large_decrement_entries.empty()) { LargeDecrementEntry entry; entry.value = gap; entry.prev = large_decrement_entries.size() - 1; large_decrement_entries.back().next = large_decrement_entries.size(); large_decrement_entries.push_back(entry); } { LargeDecrementEntry entry; entry.value = erasing_forbidden ? -INF : -instruction_score; if (!large_decrement_entries.empty()) { entry.prev = large_decrement_entries.size() - 1; large_decrement_entries.back().next = large_decrement_entries.size(); } large_decrement_entries.push_back(entry); } gap = instruction.full - instruction_score; } else { gap += instruction.full; } } std::priority_queue<LargeDecrementEntryQueueElem> large_decrement_queue; for (size_t i=0; i<large_decrement_entries.size(); ++i) { LargeDecrementEntryQueueElem elem; elem.idx = i; elem.value = large_decrement_entries[i].value; large_decrement_queue.push(elem); } // Process other programs and initialize queues. // [at start][at end] std::priority_queue<AddInstructionQueueElem> add_instruction_queue[2][2]; std::array<EndpointProposal, 2> start_proposals = {}; std::array<EndpointProposal, 2> end_proposals = {}; for (size_t program_idx = 0; program_idx < programs.size(); ++program_idx) { Program &program = programs[program_idx]; if (&program == large_program) continue; for (size_t instruction_idx=0; instruction_idx < program.instructions.size(); ++instruction_idx) { Instruction &instruction = program.instructions[instruction_idx]; instruction.used = false; const bool at_start = instruction_idx == 0; const bool at_end = instruction_idx == program.instructions.size() - 1; if (program.first_start_only && at_start) { // never add } else if (instruction.best > 0) { instruction.used = true; score += instruction.best; ++other_used_count; } else { AddInstructionQueueElem elem; elem.program_idx = program_idx; elem.instruction_idx = instruction_idx; elem.value = instruction.best; add_instruction_queue[at_start][at_end].push(elem); } } if (!start_large) { const Instruction &instruction = program.instructions.front(); EndpointProposal proposal; proposal.program_idx = program_idx; if (instruction.used) { proposal.value = 0; } else { proposal.value = instruction.best; } insert_proposal(start_proposals, proposal); } if (!end_large) { const Instruction &instruction = program.instructions.back(); if (!(program.first_start_only && &instruction == &program.instructions.front())) { // can use as an endpoint EndpointProposal proposal; proposal.program_idx = program_idx; if (instruction.used) { proposal.value = instruction.full - instruction.best; } else { proposal.value = instruction.full; } insert_proposal(end_proposals, proposal); } } } // Repeatedly make improvements while necessary. for (;;) { EndpointProposal *start; EndpointProposal *end; find_best_proposals(start_proposals, end_proposals, start, end); if (!start_large && start->program_idx == NONE_SIZE_T) { // impossible return; } if (!end_large && end->program_idx == NONE_SIZE_T) { // impossible return; } int other_middle = other_used_count; if (!start_large && programs[start->program_idx].instructions.front().used) { --other_middle; } if (!end_large && programs[end->program_idx].instructions.back().used) { --other_middle; } if (large_used_count - 1 <= other_middle) { // We are OK! if (!start_large) score += start->value; if (!end_large) score += end->value; best_score = std::max(best_score, score); return; } // Pick an improvement from one of 5 priority queues. int best_queue = -1; Counter best_value = -INF/2; while (!large_decrement_queue.empty()) { const auto &qe = large_decrement_queue.top(); const auto &entry = large_decrement_entries[qe.idx]; if (entry.value != qe.value) { // lazily clean queue and repeat large_decrement_queue.pop(); continue; } // Don't allow merging the whole large program. if (start_large && end_large && entry.prev == 0 && entry.next == large_decrement_entries.size() - 1) { break; } const Counter val = large_decrement_queue.top().value; if (val > best_value) { best_queue = 4; best_value = val; } break; } for (int at_start=0; at_start<2; ++at_start) { for (int at_end=0; at_end<2; ++at_end) { const auto &q = add_instruction_queue[at_start][at_end]; if (!q.empty()) { const auto &entry = q.top(); Counter val = entry.value; // simulate update std::array<EndpointProposal, 2> new_start_proposals = start_proposals; std::array<EndpointProposal, 2> new_end_proposals = end_proposals; if (at_start && !start_large) { EndpointProposal proposal; proposal.program_idx = entry.program_idx; proposal.value = 0; erase_proposal(new_start_proposals, proposal.program_idx); insert_proposal(new_start_proposals, proposal); } if (at_end && !end_large) { Instruction &instruction = programs[entry.program_idx].instructions.back(); EndpointProposal proposal; proposal.program_idx = entry.program_idx; proposal.value = instruction.full - instruction.best; erase_proposal(new_end_proposals, proposal.program_idx); insert_proposal(new_end_proposals, proposal); } EndpointProposal *new_start; EndpointProposal *new_end; find_best_proposals(new_start_proposals, new_end_proposals, new_start, new_end); if (!start_large) { val += new_start->value - start->value; } if (!end_large) { val += new_end->value - end->value; } if (val > best_value) { best_queue = 2*at_start+at_end; best_value = val; } } } } if (best_queue == -1) { // no more improvements return; } else if (best_queue == 4) { // large decrement const size_t idx = large_decrement_queue.top().idx; large_decrement_queue.pop(); auto &entry = large_decrement_entries[idx]; --large_used_count; score += entry.value; if (entry.prev == NONE_SIZE_T && entry.next == NONE_SIZE_T) { // last entry entry.value = -INF; } else if (entry.prev == NONE_SIZE_T) { // first entry: also erase next gap auto &next_entry = large_decrement_entries[entry.next]; assert(next_entry.next != NONE_SIZE_T); auto &next_next_entry = large_decrement_entries[next_entry.next]; next_next_entry.prev = NONE_SIZE_T; next_entry.value = -INF; } else if (entry.next == NONE_SIZE_T) { // last entry: also erase prev gap auto &prev_entry = large_decrement_entries[entry.prev]; assert(prev_entry.prev != NONE_SIZE_T); auto &prev_prev_entry = large_decrement_entries[prev_entry.prev]; prev_prev_entry.next = NONE_SIZE_T; prev_entry.value = -INF; } else { // middle entry: merge with two neighbors auto &prev_entry = large_decrement_entries[entry.prev]; auto &next_entry = large_decrement_entries[entry.next]; entry.value = prev_entry.value + next_entry.value - entry.value; prev_entry.value = -INF; next_entry.value = -INF; entry.prev = prev_entry.prev; entry.next = next_entry.next; if (entry.prev != NONE_SIZE_T) { large_decrement_entries[entry.prev].next = idx; } if (entry.next != NONE_SIZE_T) { large_decrement_entries[entry.next].prev = idx; } LargeDecrementEntryQueueElem new_elem; new_elem.idx = idx; new_elem.value = entry.value; large_decrement_queue.push(new_elem); } } else { // other increment const bool at_start = best_queue >> 1; const bool at_end = best_queue & 1; auto &q = add_instruction_queue[at_start][at_end]; const auto entry = q.top(); q.pop(); Instruction &instruction = programs[entry.program_idx].instructions[entry.instruction_idx]; assert(!instruction.used); instruction.used = true; score += instruction.best; ++other_used_count; if (at_start && !start_large) { EndpointProposal proposal; proposal.program_idx = entry.program_idx; proposal.value = 0; erase_proposal(start_proposals, proposal.program_idx); insert_proposal(start_proposals, proposal); } if (at_end && !end_large) { EndpointProposal proposal; proposal.program_idx = entry.program_idx; proposal.value = instruction.full - instruction.best; erase_proposal(end_proposals, proposal.program_idx); insert_proposal(end_proposals, proposal); } } } } int main() { init_io(); int ntc; std::cin >> ntc; for (int tc=0; tc<ntc; ++tc) { System system(std::cin); Counter res = system.solve(); std::cout << (-res) << "\n"; } }
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 | #include <bits/stdc++.h> using std::vector; void init_io() { std::cin.tie(nullptr); std::ios::sync_with_stdio(false); } using Counter = int64_t; constexpr Counter INF = 1000000000000000000LL; constexpr size_t NONE_SIZE_T = std::numeric_limits<size_t>::max(); struct Instruction { Counter full = 0; Counter best = -INF; bool used = false; }; struct Program { vector<Instruction> instructions; bool first_start_only = false; explicit Program(std::istream &input); }; Program::Program(std::istream &input) { size_t num_ops; input >> num_ops; instructions.reserve((num_ops + 1)/2); Instruction current_instruction; Counter current_val = 0; bool current_instruction_exists = false; bool seen_w = false; for (size_t i=0; i<num_ops; ++i) { char op; input >> op; switch (op) { case 'W': { if (current_instruction_exists) { instructions.push_back(current_instruction); if (!seen_w) first_start_only = true; } seen_w = true; current_instruction = Instruction{}; current_val = 0; current_instruction_exists = false; } break; case 'Z': { current_instruction.best = std::max(current_instruction.best, current_val); current_instruction.full = current_val; current_instruction_exists = true; } break; case '+': { int x; input >> x; current_val -= x; } break; case '-': { int x; input >> x; current_val += x; } break; default: { assert(false); } break; } } if (current_instruction_exists) { instructions.push_back(current_instruction); if (!seen_w) first_start_only = true; } } struct EndpointProposal { size_t program_idx = NONE_SIZE_T; Counter value = -INF; }; void insert_proposal(std::array<EndpointProposal, 2> &arr, const EndpointProposal &proposal) { if (proposal.value > arr[0].value) { arr[1] = arr[0]; arr[0] = proposal; } else if (proposal.value > arr[1].value) { arr[1] = proposal; } } void erase_proposal(std::array<EndpointProposal, 2> &arr, size_t program_idx) { if (arr[1].program_idx == program_idx) { arr[1] = EndpointProposal{}; } else if (arr[0].program_idx == program_idx) { arr[0] = arr[1]; arr[1] = EndpointProposal{}; } } class System { public: explicit System(std::istream &input); Counter solve(); private: void try_individual(); void try_greedy(); void try_with_large(bool start_large, bool end_large); void find_best_proposals(std::array<EndpointProposal, 2> &start_proposals, std::array<EndpointProposal, 2> &end_proposals, EndpointProposal *&start, EndpointProposal *&end); Counter best_score = -INF; vector<Program> programs; Program *large_program = nullptr; }; System::System(std::istream &input) { size_t num_programs; input >> num_programs; programs.reserve(num_programs); for(size_t i=0; i<num_programs; ++i) { Program program(input); if (!program.instructions.empty()) { programs.push_back(std::move(program)); } } } Counter System::solve() { if (programs.empty()) return 0; try_individual(); try_greedy(); if (large_program) { for (bool start_large : {false, true}) { for (bool end_large : {false, true}) { try_with_large(start_large, end_large); } } } return best_score; } void System::try_individual() { for (const Program &program : programs) { Counter counter = 0; for (const Instruction &instruction: program.instructions) { counter += instruction.full; } best_score = std::max(best_score, counter); } } void System::find_best_proposals(std::array<EndpointProposal, 2> &start_proposals, std::array<EndpointProposal, 2> &end_proposals, EndpointProposal *&start, EndpointProposal *&end) { start = &start_proposals[0]; end = &end_proposals[0]; if (start->program_idx!=NONE_SIZE_T && end->program_idx!=NONE_SIZE_T && start->program_idx == end->program_idx && programs[start->program_idx].instructions.size() == 1) { // Can't use the same endpoint. if (start_proposals[1].value > end_proposals[1].value) { ++start; } else { ++end; } } } void System::try_greedy() { std::vector<int> used_counts(programs.size(), 0u); int total_used_count = 0; std::array<EndpointProposal, 2> start_proposals = {}; std::array<EndpointProposal, 2> end_proposals = {}; Counter score = 0; for (size_t program_idx=0; program_idx < programs.size(); ++program_idx) { Program &program = programs[program_idx]; for (Instruction &instruction: program.instructions) { instruction.used = false; if (instruction.best > 0 && !(program.first_start_only && &instruction == &program.instructions.front())) { instruction.used = true; score += instruction.best; ++used_counts[program_idx]; ++total_used_count; } } { const Instruction &instruction = program.instructions.front(); EndpointProposal proposal; proposal.program_idx = program_idx; if (instruction.used) { proposal.value = 0; } else { proposal.value = instruction.best; } insert_proposal(start_proposals, proposal); } { const Instruction &instruction = program.instructions.back(); if (!(program.first_start_only && &instruction == &program.instructions.front())) { // can use as an endpoint EndpointProposal proposal; proposal.program_idx = program_idx; if (instruction.used) { proposal.value = instruction.full - instruction.best; } else { proposal.value = instruction.full; } insert_proposal(end_proposals, proposal); } } } EndpointProposal *start; EndpointProposal *end; find_best_proposals(start_proposals, end_proposals, start, end); if (start->program_idx==NONE_SIZE_T || end->program_idx==NONE_SIZE_T) { // Impossible. return; } { score += start->value; Instruction &instruction = programs[start->program_idx].instructions.front(); if (!instruction.used) { instruction.used = true; ++used_counts[start->program_idx]; ++total_used_count; } } { score += end->value; Instruction &instruction = programs[end->program_idx].instructions.back(); if (!instruction.used) { instruction.used = true; ++used_counts[end->program_idx]; ++total_used_count; } } for (size_t program_idx = 0; program_idx < programs.size(); ++program_idx) { const int other_middle = total_used_count - used_counts[program_idx] - (start->program_idx != program_idx) - (end->program_idx != program_idx); if (used_counts[program_idx] - 1 > other_middle) { // Not enough other middle to fill the gaps. large_program = &programs[program_idx]; return; } } best_score = std::max(best_score, score); } struct LargeDecrementEntry { Counter value = -INF; size_t prev = NONE_SIZE_T; size_t next = NONE_SIZE_T; }; struct LargeDecrementEntryQueueElem { size_t idx = NONE_SIZE_T; Counter value = -INF; }; inline bool operator<(const LargeDecrementEntryQueueElem &a, const LargeDecrementEntryQueueElem &b) { return a.value < b.value; } struct AddInstructionQueueElem { size_t program_idx = NONE_SIZE_T; size_t instruction_idx = NONE_SIZE_T; Counter value = -INF; }; inline bool operator<(const AddInstructionQueueElem &a, const AddInstructionQueueElem &b) { return a.value < b.value; } void System::try_with_large(const bool start_large, const bool end_large) { if (start_large && end_large && large_program->instructions.size() == 1) return; if (!start_large && large_program->instructions.size() == 1 && large_program->first_start_only) return; int large_used_count = 0; int other_used_count = 0; Counter score = 0; // Process large program and initialize large decrement priority queue. Counter gap = -INF; vector<LargeDecrementEntry> large_decrement_entries; large_decrement_entries.reserve(large_program->instructions.size()); for (Instruction &instruction : large_program->instructions) { instruction.used = false; bool erasing_forbidden = false; Counter instruction_score = 0; if (start_large && &instruction == &large_program->instructions.front()) { instruction.used = true; erasing_forbidden = true; instruction_score = instruction.best; } else if (end_large && &instruction == &large_program->instructions.back()) { instruction.used = true; erasing_forbidden = true; instruction_score = instruction.full; } else if (&instruction == &large_program->instructions.front() && large_program->first_start_only) { // don't use } else if (instruction.best > 0) { instruction.used = true; instruction_score = instruction.best; } if (instruction.used) { ++large_used_count; score += instruction_score; if (!large_decrement_entries.empty()) { LargeDecrementEntry entry; entry.value = gap; entry.prev = large_decrement_entries.size() - 1; large_decrement_entries.back().next = large_decrement_entries.size(); large_decrement_entries.push_back(entry); } { LargeDecrementEntry entry; entry.value = erasing_forbidden ? -INF : -instruction_score; if (!large_decrement_entries.empty()) { entry.prev = large_decrement_entries.size() - 1; large_decrement_entries.back().next = large_decrement_entries.size(); } large_decrement_entries.push_back(entry); } gap = instruction.full - instruction_score; } else { gap += instruction.full; } } std::priority_queue<LargeDecrementEntryQueueElem> large_decrement_queue; for (size_t i=0; i<large_decrement_entries.size(); ++i) { LargeDecrementEntryQueueElem elem; elem.idx = i; elem.value = large_decrement_entries[i].value; large_decrement_queue.push(elem); } // Process other programs and initialize queues. // [at start][at end] std::priority_queue<AddInstructionQueueElem> add_instruction_queue[2][2]; std::array<EndpointProposal, 2> start_proposals = {}; std::array<EndpointProposal, 2> end_proposals = {}; for (size_t program_idx = 0; program_idx < programs.size(); ++program_idx) { Program &program = programs[program_idx]; if (&program == large_program) continue; for (size_t instruction_idx=0; instruction_idx < program.instructions.size(); ++instruction_idx) { Instruction &instruction = program.instructions[instruction_idx]; instruction.used = false; const bool at_start = instruction_idx == 0; const bool at_end = instruction_idx == program.instructions.size() - 1; if (program.first_start_only && at_start) { // never add } else if (instruction.best > 0) { instruction.used = true; score += instruction.best; ++other_used_count; } else { AddInstructionQueueElem elem; elem.program_idx = program_idx; elem.instruction_idx = instruction_idx; elem.value = instruction.best; add_instruction_queue[at_start][at_end].push(elem); } } if (!start_large) { const Instruction &instruction = program.instructions.front(); EndpointProposal proposal; proposal.program_idx = program_idx; if (instruction.used) { proposal.value = 0; } else { proposal.value = instruction.best; } insert_proposal(start_proposals, proposal); } if (!end_large) { const Instruction &instruction = program.instructions.back(); if (!(program.first_start_only && &instruction == &program.instructions.front())) { // can use as an endpoint EndpointProposal proposal; proposal.program_idx = program_idx; if (instruction.used) { proposal.value = instruction.full - instruction.best; } else { proposal.value = instruction.full; } insert_proposal(end_proposals, proposal); } } } // Repeatedly make improvements while necessary. for (;;) { EndpointProposal *start; EndpointProposal *end; find_best_proposals(start_proposals, end_proposals, start, end); if (!start_large && start->program_idx == NONE_SIZE_T) { // impossible return; } if (!end_large && end->program_idx == NONE_SIZE_T) { // impossible return; } int other_middle = other_used_count; if (!start_large && programs[start->program_idx].instructions.front().used) { --other_middle; } if (!end_large && programs[end->program_idx].instructions.back().used) { --other_middle; } if (large_used_count - 1 <= other_middle) { // We are OK! if (!start_large) score += start->value; if (!end_large) score += end->value; best_score = std::max(best_score, score); return; } // Pick an improvement from one of 5 priority queues. int best_queue = -1; Counter best_value = -INF/2; while (!large_decrement_queue.empty()) { const auto &qe = large_decrement_queue.top(); const auto &entry = large_decrement_entries[qe.idx]; if (entry.value != qe.value) { // lazily clean queue and repeat large_decrement_queue.pop(); continue; } // Don't allow merging the whole large program. if (start_large && end_large && entry.prev == 0 && entry.next == large_decrement_entries.size() - 1) { break; } const Counter val = large_decrement_queue.top().value; if (val > best_value) { best_queue = 4; best_value = val; } break; } for (int at_start=0; at_start<2; ++at_start) { for (int at_end=0; at_end<2; ++at_end) { const auto &q = add_instruction_queue[at_start][at_end]; if (!q.empty()) { const auto &entry = q.top(); Counter val = entry.value; // simulate update std::array<EndpointProposal, 2> new_start_proposals = start_proposals; std::array<EndpointProposal, 2> new_end_proposals = end_proposals; if (at_start && !start_large) { EndpointProposal proposal; proposal.program_idx = entry.program_idx; proposal.value = 0; erase_proposal(new_start_proposals, proposal.program_idx); insert_proposal(new_start_proposals, proposal); } if (at_end && !end_large) { Instruction &instruction = programs[entry.program_idx].instructions.back(); EndpointProposal proposal; proposal.program_idx = entry.program_idx; proposal.value = instruction.full - instruction.best; erase_proposal(new_end_proposals, proposal.program_idx); insert_proposal(new_end_proposals, proposal); } EndpointProposal *new_start; EndpointProposal *new_end; find_best_proposals(new_start_proposals, new_end_proposals, new_start, new_end); if (!start_large) { val += new_start->value - start->value; } if (!end_large) { val += new_end->value - end->value; } if (val > best_value) { best_queue = 2*at_start+at_end; best_value = val; } } } } if (best_queue == -1) { // no more improvements return; } else if (best_queue == 4) { // large decrement const size_t idx = large_decrement_queue.top().idx; large_decrement_queue.pop(); auto &entry = large_decrement_entries[idx]; --large_used_count; score += entry.value; if (entry.prev == NONE_SIZE_T && entry.next == NONE_SIZE_T) { // last entry entry.value = -INF; } else if (entry.prev == NONE_SIZE_T) { // first entry: also erase next gap auto &next_entry = large_decrement_entries[entry.next]; assert(next_entry.next != NONE_SIZE_T); auto &next_next_entry = large_decrement_entries[next_entry.next]; next_next_entry.prev = NONE_SIZE_T; next_entry.value = -INF; } else if (entry.next == NONE_SIZE_T) { // last entry: also erase prev gap auto &prev_entry = large_decrement_entries[entry.prev]; assert(prev_entry.prev != NONE_SIZE_T); auto &prev_prev_entry = large_decrement_entries[prev_entry.prev]; prev_prev_entry.next = NONE_SIZE_T; prev_entry.value = -INF; } else { // middle entry: merge with two neighbors auto &prev_entry = large_decrement_entries[entry.prev]; auto &next_entry = large_decrement_entries[entry.next]; entry.value = prev_entry.value + next_entry.value - entry.value; prev_entry.value = -INF; next_entry.value = -INF; entry.prev = prev_entry.prev; entry.next = next_entry.next; if (entry.prev != NONE_SIZE_T) { large_decrement_entries[entry.prev].next = idx; } if (entry.next != NONE_SIZE_T) { large_decrement_entries[entry.next].prev = idx; } LargeDecrementEntryQueueElem new_elem; new_elem.idx = idx; new_elem.value = entry.value; large_decrement_queue.push(new_elem); } } else { // other increment const bool at_start = best_queue >> 1; const bool at_end = best_queue & 1; auto &q = add_instruction_queue[at_start][at_end]; const auto entry = q.top(); q.pop(); Instruction &instruction = programs[entry.program_idx].instructions[entry.instruction_idx]; assert(!instruction.used); instruction.used = true; score += instruction.best; ++other_used_count; if (at_start && !start_large) { EndpointProposal proposal; proposal.program_idx = entry.program_idx; proposal.value = 0; erase_proposal(start_proposals, proposal.program_idx); insert_proposal(start_proposals, proposal); } if (at_end && !end_large) { EndpointProposal proposal; proposal.program_idx = entry.program_idx; proposal.value = instruction.full - instruction.best; erase_proposal(end_proposals, proposal.program_idx); insert_proposal(end_proposals, proposal); } } } } int main() { init_io(); int ntc; std::cin >> ntc; for (int tc=0; tc<ntc; ++tc) { System system(std::cin); Counter res = system.solve(); std::cout << (-res) << "\n"; } } |