제출 #373851

#제출 시각아이디문제언어결과실행 시간메모리
373851ijxjdjdRectangles (IOI19_rect)C++14
컴파일 에러
0 ms0 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; rightP[i][j].push_back({lst, p}); // 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; downP[i][j].push_back({p, lst}); // 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++) { 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 == 1 || M == 1) { 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); } 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:121:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  121 |                 while (u < downP[i][j].size() && downP[i][j][u].f <= p.f) {
      |                        ~~^~~~~~~~~~~~~~~~~~~~
rect.cpp:127:39: error: expected ')' before ';' token
  127 |             memset(fen, 0, sizeof(fen);)
      |                   ~                   ^
      |                                       )
rect.cpp:127:40: error: expected primary-expression before ')' token
  127 |             memset(fen, 0, sizeof(fen);)
      |                                        ^