제출 #842134

#제출 시각아이디문제언어결과실행 시간메모리
842134Tenis0206축구 경기장 (IOI23_soccer)C++17
0 / 100
0 ms344 KiB
#include <bits/stdc++.h> #include "soccer.h" using namespace std; const int nmax = 2e3; int n; int a[nmax + 5][nmax + 5]; int st[nmax + 5], dr[nmax + 5]; int Minst[nmax + 5], Maxdr[nmax + 5]; bool verif() { for(int i=0; i<=n; i++) { st[i] = n + 1; dr[i] = 0; } for(int i=1; i<=n; i++) { for(int j=1; j<=n; j++) { if(a[i][j]==0 && a[i][j - 1]==1) { if(st[i]) { return false; } st[i] = j; } if(a[i][j]==0) { dr[i] = j; } } } for(int i=1;i<=n;i++) { Minst[i] = min(Minst[i - 1], st[i]); Maxdr[i] = max(Maxdr[i - 1], dr[i]); } bool desc = false, start = false; stack<int> stl, str; for(int i=1; i<=n; i++) { if(st[i] && !st[i - 1] && start) { return false; } if(st[i]) { start = true; if(st[i - 1] && st[i] < st[i - 1] && desc) { return false; } if(st[i - 1] && st[i] > st[i - 1]) { desc = true; } if(dr[i - 1] && dr[i] > dr[i - 1] && desc) { return false; } if(dr[i - 1] && dr[i] < dr[i - 1]) { desc = true; } int u_st = 0, u_dr = 0; while(!stl.empty() && st[i] >= st[stl.top()]) { stl.pop(); } if(stl.empty()) { u_st = 0; } else { u_st = stl.top(); } stl.push(i); while(!str.empty() && dr[i] <= dr[str.top()]) { str.pop(); } if(str.empty()) { u_dr = 0; } else { u_dr = str.top(); } str.push(i); if(Minst[u_dr - 1] < st[i]) { return false; } if(Maxdr[u_st - 1] > dr[i]) { return false; } } } return true; } int biggest_stadium(int N, std::vector<std::vector<int>> F) { n = N; int nre = 0; for(int i=1; i<=n; i++) { for(int j=1; j<=n; j++) { a[i][j] = F[i - 1][j - 1]; nre += (1 - a[i][j]); } } for(int i=0; i<=n; i++) { a[i][0] = a[0][i] = a[i][n + 1] = a[n + 1][i] = 1; } bool ok = verif(); if(ok) { return nre; } return 0; }
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