有没有大佬知道这题怎么做

必关

#include<stdio.h>
#include<math.h>
#include<stdbool.h>
int a[105][105];
int b[105][105];
int main()
{
	int n, m;
	double sum = 0.0;
	scanf("%d %d", &n, &m);
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= m; j++) {
			scanf("%d", &a[i][j]);
		}
	}
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j < m; j++) {
			scanf("%d", &b[i][j]);
			if (b[i][j] == a[i][j]) {
				sum++;
			}
		}
	}
	double s = (double) (m * n);
	printf("%.2lf", sum *100.0/ s);
	return 0;
}