Submission #500794

#	Time	Username	Problem	Language	Result	Execution time	Memory
500794		AmirElarbi	Furniture (JOI20_furniture)	C++14	0 / 100	2 ms	332 KiB

furniture

#include <bits/stdc++.h>
#define vi vector<int>
#define ve vector
#define ll long long
#define vf vector<float>
#define vll vector<pair<ll,ll>>
#define ii pair<int,int>
#define vvi vector<vi>
#define vii vector<ii>
#define gii greater<ii>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define INF 1e9
#define eps 1e-7
#define eps1 1e-25
#define optimise ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define MAX_A 1e5+5
#define V 450
using namespace std;
const int MOD = 1e9+7;
const int nax = 200005;
bool grid[1005][1005],vis[1005][1005];
int n,m;
bool dfs(int x, int y){
    if(x == n-1 && y == m-1) return 1;
    if(x >= n || y >= m) return 0;
    if(grid[x][y]) return 0;
    if(vis[x][y]) return 0;
    vis[x][y] = 1;
    return max(dfs(x+1,y),dfs(x,y+1));
}
int main(){
    optimise;
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
    cin>>n >>m;
    for (int i = 0; i < n; ++i)
    {
        for (int j = 0; j < m; ++j)
        {
            cin >> grid[i][j];
        }
    }
    int q;
    cin >>q;
    while(q--){
        int x,y;
        cin >> x >> y;
        x--,y--;
        grid[x][y] = 1;
        memset(vis,0,sizeof vis);
        int a = dfs(0,0);
        cout << a << '\n';
        grid[x][y] = a;
    }
}

Compilation message (stderr)

furniture.cpp: In function 'int main()':
furniture.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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