P1162的数据太水了吧！这代码也能A？？？

#include <iostream>
#include <algorithm>
#include <cstdio>
using namespace std;
long long n,a[50][50],x,y,z,s; 
int main()
{
    //freopen(".in","r",stdin);
    //freopen(".out","w",stdout);
    cin>>n;
    for (int i=0;i<n;i++)
        for (int j=0;j<n;j++)
            cin>>a[i][j];
    for (int i=0;i<n;i++)
    {
        for (int j=0;j<n;j++)
        {
            x=y=z=s=0;
            if (a[i][j]==0)
            {
                for (int k=i;k>=0;k--) if (a[k][j]==1) s=1;
                for (int k=i;k<n;k++ ) if (a[k][j]==1) x=1;
                for (int k=j;k>=0;k--) if (a[i][k]==1) z=1;
                for (int k=j;k<n;k++ ) if (a[i][k]==1) y=1;
            }
            if (x==1 && y==1 && z==1 && s==1 && a[i][j]!=1) a[i][j]=2;
        }
    }
    for (int i=0;i<n;i++)
    {
        for (int j=0;j<n;j++)
            cout<<a[i][j]<<" ";
        cout<<endl;
    }
    return 0;
}