20分求助

#include<bits/stdc++.h>

using namespace std;
long long n,a[1001][1001];
int main(){
	cin>>n;
	for(int i=1;i<=n;++i){
		for(int j=1;j<=n;++j){
			//cin>>a[i][j];
			scanf("%1lld",&a[i][j]);
			//cout<<a[i][j]<<" ";
		}
	}
	int ana=0;
	for(int i=1;i<=n-1;++i){
		for(int j=1;j<=n-1;++j){
			if(a[i][j]==1){
				for(int z=1;z<=min(n-i,n-j);++z){
				int ans=0;
					if(a[i+z][j+z]==1){
						bool qq=0;
						if(a[i][j+z]==1){
							for(int q=1;q<=z;++q){
								if(a[i+q][j+z-q]==1);
								else {
									qq=1;break;
								}
							}
							if(qq==0) ans++;
							//else ans++;
						}
						//else break;
					}
					//else break;
					ana+=ans;
				}
			}
			else continue;
		}
	}
	cout<<ana;
}