hdu1175连连看

#include<iostream>
#include<cstring>
#include<cstdio>
#include<cmath>

using namespace std;

int an[1100][1100];
int n,m;

bool f1(int x1,int y1,int x2,int y2)
{
    if(x1 == x2)
    {
        int a = 0;
        for(int i = min(y1,y2)+1;i<max(y1,y2);i++)
        {
            a+=an[x1][i];
        }
        if(a==0) return 1;
    }
    if(y1 == y2)
    {
        int a = 0;
        for(int i = min(x1,x2)+1;i<max(x1,x2);i++)
        {
            a+=an[i][y1];
        }
        if(a==0) return 1;
    }
    return 0;
}
bool f2(int x1,int y1,int x2,int y2)
{
    if(an[x1][y2] == 0&&f1(x1,y1,x1,y2)&&f1(x1,y2,x2,y2)) return 1;
    if(an[x2][y1] == 0&&f1(x1,y1,x2,y1)&&f1(x2,y1,x2,y2)) return 1;
    return 0;
}
bool f3(int x1,int y1,int x2,int y2)
{
    int i;
    for(i = 1;i<=n;i++)
    {
        if(an[i][y1] == 0&&an[i][y2] == 0&&f1(x1,y1,i,y1)&&f1(i,y1,i,y2)&&f1(i,y2,x2,y2))return 1;
    }
    for(i = 1;i<=m;i++)
    {
        if(an[x1][i] == 0&&an[x2][i] == 0&&f1(x1,y1,x1,i)&&f1(x1,i,x2,i)&&f1(x2,i,x2,y2))return 1;
    }
    return 0;
}

int main()
{
    int i,j,k;
    while(cin>>n>>m)
    {
        if(n == 0&&m == 0) return 0;
        for(i = 1;i<=n;i++)
            for(j = 1;j<=m;j++)
                scanf("%d",&an[i][j]);
        int q;
        cin>>q;
        while(q--)
        {
            int x1,x2,y1,y2;
            scanf("%d%d%d%d",&x1,&y1,&x2,&y2);
            bool bl = 0;
            if(f1(x1,y1,x2,y2))bl = 1;
            else if(f2(x1,y1,x2,y2))bl = 1;
            else if(f3(x1,y1,x2,y2))bl = 1;
            if(an[x1][y1]!=an[x2][y2]||an[x1][y1] == 0) bl = 0;
            if(bl) cout<<"YES"<<endl;
            else cout<<"NO"<<endl;
        }
    }
    return 0;

}