Submission #936389

#	Time	Username	Problem	Language	Result	Execution time	Memory
936389		OAleksa	Furniture (JOI20_furniture)	C++14	0 / 100	3 ms	4660 KiB

furniture

#include <bits/stdc++.h>
using namespace std;
#define f first
#define s second
#define int long long
const int N = 1069;
int n, m, a[N][N], dp1[N][N], dp2[N][N];
int g[N][N], cnt[2 * N];
signed main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int tt = 1;
  //cin >> tt;
  while (tt--) {
  	cin >> n >> m;
  	for (int i = 1;i <= n;i++) {
  		for (int j = 1;j <= m;j++) {
  			cin >> a[i][j];
  			g[i][j] = a[i][j];
  		}
  	}
  	for (int i = 0;i <= m + 1;i++) 
  		g[0][i] = g[n + 1][i] = 1;
  	for (int i = 0;i <= n + 1;i++)
  		g[i][0] = g[i][m + 1] = 1;
  	for (int i = 1;i <= n;i++) {
  		for (int j = 1;j <= m;j++) {
  			if ((i == 1 && j == 1) || (i == n && j == m))
  				continue;
  			if (!g[i][j] && g[i][j - 1] && g[i - 1][j])
  				g[i][j] = 1;
  		}
  	}
  	for (int i = n;i >= 1;i--) {
  		for (int j = m;j >= 1;j--) {
  			if ((i == 1 && j == 1) || (i == n && j == m))
  				continue;
  			if (!g[i][j] && g[i][j + 1] && g[i + 1][j])
  				g[i][j] = 1;
  		}
  	}
  	for (int i = 1;i <= n;i++) {
  		for (int j = 1;j <= m;j++) {
  			if (!g[i][j])
  				cnt[i + j]++;
  		}
  	}
  	g[1][1] = g[n][m] = 0;
  	int q;
  	cin >> q;
  	while (q--) {
  		int x, y;
  		cin >> x >> y;
  		if (g[x][y]) 
  			cout << 1 << '\n';
  		else {
  			if (cnt[x + y] == 1)
  				cout << 0 << '\n';
  			else {
  				cout << 1 << '\n';
  				queue<pair<int, int>> q;
  				q.push({x, y});
  				while (!q.empty()) {
						auto v = q.front();
						int i = v.f, j = v.s;
						g[i][j] = 1;
						cnt[i + j]--;
						q.pop();
						if (i > 0 && g[i - 1][j + 1] && !g[i - 1][j])
							q.push({i - 1, j});
						if (j > 0 && g[i + 1][j - 1] && !g[i][j - 1])
							q.push({i, j - 1});
					}
					q.push({x, y});
					while (!q.empty()) {
						auto v = q.front();
						int i = v.f, j = v.s;
						g[i][j] = 1;
						if (i != x && j != y)
							cnt[i + j]--;
						q.pop();
						if (i > 0 && g[i - 1][j + 1] && !g[i][j + 1])
							q.push({i, j + 1});
						if (j > 0 && g[i + 1][j - 1] && !g[i + 1][j])
							q.push({i + 1, j});
					}
	  		}
  		}
  	}
  }
  return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95