2893: 肿瘤面积

#include<iostream>
using namespace std;
int main()
{
    int n,arr[1001][1001],ax=0,ay=0,bx=0,by=0;
    bool first=true;
    cin>>n;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++)
        {
            cin>>arr[i][j];
            if(arr[i][j]==0)
            {
                if(first)
                    ax=i,ay=j,first=false;
                bx=i,by=j;
            }
        }
    if(bx>ax&&by>ay)
        cout<<(by-ay-1)*(bx-ax-1);
    else
        cout<<0;
    return 0;
}