Submission #1013903

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013903		Baytoro	Crossing (JOI21_crossing)	C++17	0 / 100	1 ms	4444 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pb push_back
#define fr first
#define sc second
//#define int ll
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
int n,m;
int a[1005][1005],diag[100005];
vector<int> dx={1,-1,0,0},
            dy={0,0,1,-1};
void bfs(int x, int y) {
    if(a[x][y]==1) return;
    diag[x+y]--;
    a[x][y]=1;
    for(int i=0;i<4;i++) {
        int X=x+dx[i],Y=y+dy[i];
        if(!a[X][Y] && ((a[X-1][Y] && a[X][Y-1] && !(X==1 && Y==1)) || (a[X+1][Y] && a[X][Y+1] && !(X==n && Y==m)))) {
            bfs(X,Y);
        }
    }

}
void solve() {
    cin>>n>>m;
    vector<pair<int,int>> v;
    memset(a,1,sizeof a);
    for(int i=1;i<=n;i++) {
        for(int j=1;j<=m;j++) {
            //cin>>a[i][j];
            int x;cin>>x;
            if(x) v.pb({i,j});
            diag[i+j]++;
            a[i][j]=0;
        }
    }
    for(auto it: v)
        bfs(it.fr,it.sc);
    /*for(int i=1;i<=n;i++) {
        for(int j=1;j<=m;j++) {
            cout<<a[i][j]<<' ';
        }
        cout<<endl;
    }*/
    int q;cin>>q;
    while(q--) {
        int x,y;cin>>x>>y;
        if(a[x][y]) {
            cout<<1<<endl;
            continue;
        }
        if(diag[x+y]==1) {
            cout<<0<<endl;
            continue;
        }
        cout<<1<<endl;
        bfs(x,y);
    }
}
signed main(){
    int t=1;//cin>>t;
    while(t--){
        solve();
    }
}
//#endif

• Subtask 1: 0 / 3
• Subtask 2: 0 / 23
• Subtask 3: 0 / 23
• Subtask 4: 0 / 51