Submission #1210094

#	Time	Username	Problem	Language	Result	Execution time	Memory
1210094		nguyn	Furniture (JOI20_furniture)	C++20	100 / 100	153 ms	6452 KiB

furniture

#include <bits/stdc++.h>
using namespace std;

#define ll long long 
#define F first
#define S second
#define pb push_back 
#define pii pair<int,int>

const int N = 1e3 + 5;

int vis[N][N], n, m; 
int d[2 * N];

void block(int x, int y) {
	d[x + y]--; 
	vis[x][y] = 1;
	if (vis[x + 1][y - 1] && !vis[x + 1][y]) block(x + 1, y); 
	if (vis[x + 1][y - 1] && !vis[x][y - 1]) block(x, y - 1);
	if (vis[x - 1][y + 1] && !vis[x - 1][y]) block(x - 1, y); 
	if (vis[x - 1][y + 1] && !vis[x][y + 1]) block(x, y + 1);
}

signed main(){
    ios_base::sync_with_stdio(false) ; 
    cin.tie(0) ; cout.tie(0) ; 
    if (fopen("INP.INP" ,"r")) {
        freopen("INP.INP" ,"r" , stdin) ;
        freopen("OUT.OUT" , "w" , stdout) ;
    }
    cin >> n >> m;
    for (int i = 1; i <= n; i++) {
    	for (int j = 1; j <= m; j++) {
    		d[i + j]++; 
    		vis[i][j] = 0;
    	}
    }
    for (int i = 0; i <= n + 1; i++) {
    	vis[i][0] = 1;
    	vis[i][m + 1] = 1;
    }
    for (int i = 0; i <= m + 1; i++) {
    	vis[0][i] = 1; 
    	vis[n + 1][i] = 1;
    }
    for (int i = 1; i <= n; i++) {
    	for (int j = 1; j <= m; j++) {
    		int c; 
    		cin >> c;
    		if (c && !vis[i][j]) {
    			block(i, j);
    		}
    	}
    }
    int q; 
    cin >> q; 
    while(q--) {
    	int x, y; 
    	cin >> x >> y;
    	if (vis[x][y]) {
    		cout << 1 << '\n';
    	}
    	else if (d[x + y] == 1) {
    		cout << 0 << '\n'; 
    	}
    	else {
    		cout << 1 << '\n';
    		block(x, y); 
    	}
    }
}

Compilation message (stderr)

furniture.cpp: In function 'int main()':
furniture.cpp:28:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |         freopen("INP.INP" ,"r" , stdin) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:29:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |         freopen("OUT.OUT" , "w" , stdout) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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