제출 #1355633

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1355633		free_de_la_zenith	Furniture (JOI20_furniture)	C++20	5 / 100	5091 ms	5100 KiB

furniture

/**
 *    author:  MINHTPC
 *
**/
#include <bits/stdc++.h>

#define ll long long
#define fi first
#define se second
#define pb push_back
#define all(a) a.begin() , a.end()
#define FOR(i ,a , b) for(int i = a ; i <= b ; ++i)
#define bit(mask,i) ((mask>>i)&1)
#define name "task"
#define lo lower_bound
#define up upper_bound
#define count_bit1(x) __builtin_popcountll(x)
#define count_bit01(x) __builtin_clzll(x)
#define count_bit10(x) __builtin_ctzll(x)

using namespace std;
const int N=1e3+5;
int a[N][N];
using pii=pair<int,int>;
int n,m;
int dx[]={1,0};
int dy[]={0,1};
bool check(int x,int y) {
    return x>=1 && x<=n && y>=1 && y<=m && a[x][y]==0;
}
bool vis[N][N];
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);cout.tie(0);
    if(fopen("umnik.inp","r")) {
        freopen("umnik.inp","r",stdin);
    }
    cin >> n >> m;
    for(int i=1;i<=n;i++) {
        for(int j=1;j<=m;j++) cin >> a[i][j];
    }
    int q;
    cin >> q;
    while(q--) {
        int cx,cy;
        cin >> cx >> cy;
        int old_val=a[cx][cy];
        a[cx][cy]=1;
        queue<pii>q;
        q.push({1,1});
        memset(vis,0,sizeof vis);
        vis[1][1]=1;
        while(!q.empty()) {
            auto cur=q.front();q.pop();
            int x=cur.fi,y=cur.se;
            for(int i=0;i<2;i++) {
                int nx=x+dx[i],ny=y+dy[i];
                if(!check(nx,ny)) continue;
                if(!vis[nx][ny]) {
                    vis[nx][ny]=1;
                    q.push({nx,ny});
                }
            }
        }
        if(vis[n][m]==0) {
            cout << 0 << '\n';
            a[cx][cy]=old_val;
        }
        else cout << 1 << '\n';
    }
}

컴파일 시 표준 에러 (stderr) 메시지

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("umnik.inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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