二维枚举

#include <bits/stdc++.h>
using namespace std;
const int N = 5e2+10;
int a[N][N];
int main(){ 
	int n,m;
	int i,j, x, y;
	cin >> n >>m;
	for(i = 1; i<= n; i++){
        for(j = 1; j<= m; j++){
            cin >> a[i][j];
        }
    }	
	int s = 0;
	for(i = 1; i < n; i++){
		for(j = 1; j < m; j++){
			x = i+1;
			y = j+1;
			if(a[i][j]*a[x][y] == a[x][j]*a[i][y]){
				s++;
			}
		}
	}
	cout << s;	
    return 0; 
}