#include <algorithm>
#include <vector>
#include <iostream>
using namespace std;
int count_islands(const std::vector<int> &nums) {
bool onIsland = false;
int cnt = 0;
for (const int num: nums) {
if (num != 0) {
if (!onIsland) {
onIsland = true;
cnt += 1;
}
} else {
onIsland = false;
}
}
return cnt;
}
vector<int> extract_island(const std::vector<int> &nums) {
vector<int> result;
ranges::copy_if(nums, back_inserter(result), [](const int num) { return num != 0; });
return result;
}
bool check(std::vector<int> &island) {
vector nums(island.begin(), island.end());
while (nums.size() > 2) {
auto a = nums.back();
nums.pop_back();
auto b = nums.back();
nums.pop_back();
if (b >= a) {
nums.push_back(b - a + 1);
} else {
return false;
}
}
if (nums.size() == 1) {
return nums[0] == 1;
}
if (nums.size() == 2) {
auto a = nums[nums.size() - 1];
auto b = nums[nums.size() - 2];
return a - b == 0 || a - b == 1;
}
throw runtime_error("Should never happen");
}
vector<int> reduce_right(const std::vector<int> &nums) {
vector result(nums.rbegin(), nums.rend());
const auto n = result.size();
for (int i = 0; i + 2 <= n; i++) {
const auto delta = min(result[i], result[i + 1]) - 1;
result[i] = result[i] - delta;
result[i + 1] = result[i + 1] - delta;
}
return result;
}
void readAndSolveTestCase() {
int a, n;
cin >> n;
vector<int> nums;
for (int i = 0; i < n; i++) {
cin >> a;
nums.push_back(a);
}
const auto islands_count = count_islands(nums);
if (islands_count > 1) {
cout << "NIE" << endl;
return;
}
auto island = extract_island(nums);
if (island.size() == 1) {
cout << (island[0] == 1 ? "TAK" : "NIE") << endl;
return;
}
if (check(island)) {
cout << "TAK" << endl;
return;
}
island[island.size() - 2] -= 1;
if (check(island)) {
cout << "TAK" << endl;
} else {
cout << "NIE" << endl;
}
}
int main() {
ios_base::sync_with_stdio(false);
int t;
cin >> t;
while (t--) {
readAndSolveTestCase();
}
return 0;
}
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 | #include <algorithm> #include <vector> #include <iostream> using namespace std; int count_islands(const std::vector<int> &nums) { bool onIsland = false; int cnt = 0; for (const int num: nums) { if (num != 0) { if (!onIsland) { onIsland = true; cnt += 1; } } else { onIsland = false; } } return cnt; } vector<int> extract_island(const std::vector<int> &nums) { vector<int> result; ranges::copy_if(nums, back_inserter(result), [](const int num) { return num != 0; }); return result; } bool check(std::vector<int> &island) { vector nums(island.begin(), island.end()); while (nums.size() > 2) { auto a = nums.back(); nums.pop_back(); auto b = nums.back(); nums.pop_back(); if (b >= a) { nums.push_back(b - a + 1); } else { return false; } } if (nums.size() == 1) { return nums[0] == 1; } if (nums.size() == 2) { auto a = nums[nums.size() - 1]; auto b = nums[nums.size() - 2]; return a - b == 0 || a - b == 1; } throw runtime_error("Should never happen"); } vector<int> reduce_right(const std::vector<int> &nums) { vector result(nums.rbegin(), nums.rend()); const auto n = result.size(); for (int i = 0; i + 2 <= n; i++) { const auto delta = min(result[i], result[i + 1]) - 1; result[i] = result[i] - delta; result[i + 1] = result[i + 1] - delta; } return result; } void readAndSolveTestCase() { int a, n; cin >> n; vector<int> nums; for (int i = 0; i < n; i++) { cin >> a; nums.push_back(a); } const auto islands_count = count_islands(nums); if (islands_count > 1) { cout << "NIE" << endl; return; } auto island = extract_island(nums); if (island.size() == 1) { cout << (island[0] == 1 ? "TAK" : "NIE") << endl; return; } if (check(island)) { cout << "TAK" << endl; return; } island[island.size() - 2] -= 1; if (check(island)) { cout << "TAK" << endl; } else { cout << "NIE" << endl; } } int main() { ios_base::sync_with_stdio(false); int t; cin >> t; while (t--) { readAndSolveTestCase(); } return 0; } |
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