#include <iostream> #include <vector> #include <algorithm> #include <set> using namespace std; struct seg_tree { vector<int>t; int leaf_count; seg_tree(int n) { for(leaf_count = 1; leaf_count < n; leaf_count *= 2) {} t.resize(leaf_count * 2); } void add(int x, int value) { for(x += leaf_count; x > 0; x /= 2) t[x] += value; } int suffix_sum(int x) { if(x < 0 || x >= leaf_count) return 0; int answer = t[x + leaf_count]; for(x += leaf_count; x > 1; x /= 2) { if(x % 2 == 0) { answer += t[x + 1]; } } return answer; } }; int get_id(int x, int y, vector<pair<int, int>>&v) { return lower_bound(v.begin(), v.end(), make_pair(x, y)) - v.begin(); } struct Event { int x, y, id; Event() {} Event(int _x, int _y, int _id) : x(_x), y(_y), id(_id) {} }; bool operator< (Event a, Event b) { if(a.x == b.x) return a.id > b.id; return a.x > b.x; } vector<long long>solve(vector<int>y) { int n = y.size(); vector<long long>answer(n, n - 1); for(int q = 0; q < 2; q++) { vector<int>x(n); for(int i = 1; i < n; i++) x[y[i]] = i; vector<int>y_max(n), x_max(n); y_max[0] = y[0]; x_max[0] = x[0]; for(int i = 1; i < n; i++) { y_max[i] = max(y_max[i - 1], y[i]); x_max[i] = max(x_max[i - 1], x[i]); } set<pair<int, int>>states_set; vector<pair<int, int>>states; for(int i = 0; i < n; i++) { int my_x = x_max[y[i]]; int my_y = y_max[i]; while(states_set.find(make_pair(my_x, my_y)) == states_set.end()) { states_set.insert(make_pair(my_x, my_y)); states.emplace_back(my_x, my_y); int new_my_x = x_max[my_y]; int new_my_y = y_max[my_x]; my_x = new_my_x; my_y = new_my_y; } } sort(states.begin(), states.end()); vector<long long>states_values(states.size()); vector<Event>events; for(int i = 0; i < (int)states.size(); i++) events.emplace_back(states[i].first, states[i].second, i + 1); for(int i = 0; i < n; i++) events.emplace_back(i, y[i], -(i + 1)); sort(events.begin(), events.end()); seg_tree t(n); for(Event e : events) { int id = abs(e.id) - 1; if(e.id < 0) { answer[q % 2 == 0 ? id : n - id - 1] += t.suffix_sum(e.y + 1); t.add(e.y, 1); } else { states_values[id] += t.suffix_sum(e.y + 1); } } for(int i = (int)states.size() - 2; i >= 0; i--) { int next_x = x_max[states[i].second]; int next_y = y_max[states[i].first]; states_values[i] += states_values[get_id(next_x, next_y, states)]; } for(int i = 0; i < n; i++) { int my_x = x_max[y[i]]; int my_y = y_max[i]; int ind = q % 2 == 0 ? i : n - i - 1; answer[ind] += states_values[get_id(my_x, my_y, states)]; } reverse(y.begin(), y.end()); for(int &t : y) t = n - t - 1; } return answer; } int main() { ios_base::sync_with_stdio(0); int n; cin >> n; vector<int>p(n); for(int &x : p) { cin >> x; x--; } for(int i = 0; i < n; i++) { int j = i, mx = p[i], mn = p[i]; while(mx > j) { j++; mx = max(mx, p[j]); mn = min(mn, p[j]); } vector<int>sub_p(j - i + 1); for(int k = i; k <= j; k++) sub_p[k - i] = p[k] - mn; vector<long long>answer = solve(sub_p); for(long long x : answer) cout << x << ' '; i = j; } cout << '\n'; 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 | #include <iostream> #include <vector> #include <algorithm> #include <set> using namespace std; struct seg_tree { vector<int>t; int leaf_count; seg_tree(int n) { for(leaf_count = 1; leaf_count < n; leaf_count *= 2) {} t.resize(leaf_count * 2); } void add(int x, int value) { for(x += leaf_count; x > 0; x /= 2) t[x] += value; } int suffix_sum(int x) { if(x < 0 || x >= leaf_count) return 0; int answer = t[x + leaf_count]; for(x += leaf_count; x > 1; x /= 2) { if(x % 2 == 0) { answer += t[x + 1]; } } return answer; } }; int get_id(int x, int y, vector<pair<int, int>>&v) { return lower_bound(v.begin(), v.end(), make_pair(x, y)) - v.begin(); } struct Event { int x, y, id; Event() {} Event(int _x, int _y, int _id) : x(_x), y(_y), id(_id) {} }; bool operator< (Event a, Event b) { if(a.x == b.x) return a.id > b.id; return a.x > b.x; } vector<long long>solve(vector<int>y) { int n = y.size(); vector<long long>answer(n, n - 1); for(int q = 0; q < 2; q++) { vector<int>x(n); for(int i = 1; i < n; i++) x[y[i]] = i; vector<int>y_max(n), x_max(n); y_max[0] = y[0]; x_max[0] = x[0]; for(int i = 1; i < n; i++) { y_max[i] = max(y_max[i - 1], y[i]); x_max[i] = max(x_max[i - 1], x[i]); } set<pair<int, int>>states_set; vector<pair<int, int>>states; for(int i = 0; i < n; i++) { int my_x = x_max[y[i]]; int my_y = y_max[i]; while(states_set.find(make_pair(my_x, my_y)) == states_set.end()) { states_set.insert(make_pair(my_x, my_y)); states.emplace_back(my_x, my_y); int new_my_x = x_max[my_y]; int new_my_y = y_max[my_x]; my_x = new_my_x; my_y = new_my_y; } } sort(states.begin(), states.end()); vector<long long>states_values(states.size()); vector<Event>events; for(int i = 0; i < (int)states.size(); i++) events.emplace_back(states[i].first, states[i].second, i + 1); for(int i = 0; i < n; i++) events.emplace_back(i, y[i], -(i + 1)); sort(events.begin(), events.end()); seg_tree t(n); for(Event e : events) { int id = abs(e.id) - 1; if(e.id < 0) { answer[q % 2 == 0 ? id : n - id - 1] += t.suffix_sum(e.y + 1); t.add(e.y, 1); } else { states_values[id] += t.suffix_sum(e.y + 1); } } for(int i = (int)states.size() - 2; i >= 0; i--) { int next_x = x_max[states[i].second]; int next_y = y_max[states[i].first]; states_values[i] += states_values[get_id(next_x, next_y, states)]; } for(int i = 0; i < n; i++) { int my_x = x_max[y[i]]; int my_y = y_max[i]; int ind = q % 2 == 0 ? i : n - i - 1; answer[ind] += states_values[get_id(my_x, my_y, states)]; } reverse(y.begin(), y.end()); for(int &t : y) t = n - t - 1; } return answer; } int main() { ios_base::sync_with_stdio(0); int n; cin >> n; vector<int>p(n); for(int &x : p) { cin >> x; x--; } for(int i = 0; i < n; i++) { int j = i, mx = p[i], mn = p[i]; while(mx > j) { j++; mx = max(mx, p[j]); mn = min(mn, p[j]); } vector<int>sub_p(j - i + 1); for(int k = i; k <= j; k++) sub_p[k - i] = p[k] - mn; vector<long long>answer = solve(sub_p); for(long long x : answer) cout << x << ' '; i = j; } cout << '\n'; return 0; } |