제출 #373857

#제출 시각아이디문제언어결과실행 시간메모리
373857ijxjdjdRectangles (IOI19_rect)C++14
0 / 100
4 ms1900 KiB
#include "rect.h" #include <bits/stdc++.h> #define f first #define s second const int MAXN = 85; using ll = long long; std::unordered_set<int> right[MAXN][MAXN]; std::unordered_set<int> down[MAXN][MAXN]; std::vector<std::pair<int, int>> rightP[MAXN][MAXN]; std::vector<std::pair<int, int>> downP[MAXN][MAXN]; std::vector<std::vector<int>> a; int N, M; void setPairs() { for (int i = 0; i < N; i++) { for (int j = 0; j < M; j++) { for (int p : right[i][j]) { int u = i; while (right[u+1][j].count(p)) { u++; } int lst = u; while (u >= i) { rightP[u][j].push_back({lst, p}); if (u != i) { right[u][j].erase(p); } u--; } } } } for (int j = 0; j < M; j++) { for (int i = 0; i < N; i++) { for (int p : down[i][j]) { int u = j; while (down[i][u+1].count(p)) { u++; } int lst = u; while (u >= j) { downP[i][u].push_back({p, lst}); if (u != j) { down[i][u].erase(p); } u--; } } } } } void getIntervals() { // for (int i = 1; i < N-1; i++) { // for (int j = 1; j < M-1; j++) { // int mx = 0; // for (int k = j; k < M-1; k++) { // mx = std::max(mx, a[i][k]); // if (a[i][j-1] > mx && a[i][k+1] > mx) { // right[i][j].insert(k); // } // } // } // } for (int j = 1; j < M-1; j++) { for (int i = 1; i < N-1; i++) { int mx = 0; for (int k = i; k < N-1; k++) { mx = std::max(mx, a[k][j]); if (a[i-1][j] > mx && a[k+1][j] > mx) { down[i][j].insert(k); } } } } for (int i = 1; i < N-1; i++) { std::stack<std::pair<int, int>> st; st.push({a[i][0], 0}); for (int j = 1; j < M; j++) { while (st.size() && a[i][j] > st.top().f) { if (st.top().s + 1 <= j-1) { right[i][st.top().s+1].insert(j-1); } st.pop(); } if (st.size() && st.top().s + 1 <= j-1) { right[i][st.top().s+1].insert(j-1); } st.push({a[i][j], j}); } } // for (int j = 1; j < M-1; j++) { // std::stack<std::pair<int, int>> st; // st.push({a[0][j], 0}); // for (int i = 1; i < N; i++) { // while (st.size() && a[i][j] > st.top().f) { // if (st.top().s + 1 <= i-1) { // down[st.top().s+1][j].insert(i-1); // } // st.pop(); // } // if (st.size() && st.top().s + 1 <= i-1) { // down[st.top().s+1][j].insert(i-1); // } // st.push({a[i][j], i}); // } // } setPairs(); } int fen[MAXN]; void add(int val, int id) { for (;id<MAXN;id=(id|(id+1))) { fen[id]+=val; } } int sm(int r) { int rs = 0; for (;r >= 0; r=(r&(r+1)) - 1) { rs += fen[r]; } return rs; } int sm(int l, int r) { return sm(r) - sm(l-1); } long long count_rectangles(std::vector<std::vector<int> > board) { a = board; N = a.size(); M = a[0].size(); if (N <= 2 || M <= 2) { return 0; } getIntervals(); ll res = 0; for (int i = 0; i < N; i++) { for (int j = 0; j < M; j++) { std::sort(rightP[i][j].begin(), rightP[i][j].end()); std::sort(downP[i][j].begin(), downP[i][j].end()); int u = 0; for (auto& p : rightP[i][j]) { while (u < downP[i][j].size() && downP[i][j][u].f <= p.f) { add(1, downP[i][j][u].s); u++; } res += sm(p.s, MAXN-1); // for (auto& u : downP[i][j]) { // if (u.f <= p.f && u.s >= p.s) { // res++; // } // } } // memset(fen, 0, sizeof(fen)); while (--u>= 0) { add(-1, downP[i][j][u].s); } } } return res; }

컴파일 시 표준 에러 (stderr) 메시지

rect.cpp: In function 'long long int count_rectangles(std::vector<std::vector<int> >)':
rect.cpp:140:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  140 |                 while (u < downP[i][j].size() && downP[i][j][u].f <= p.f) {
      |                        ~~^~~~~~~~~~~~~~~~~~~~
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