计算概论题目（C语言）

#include <stdio.h>
#include<stdlib.h> 
int main() {
    int m, n;
    scanf("%d %d", &m, &n);
    int **a, **b, **c;
    a=(int **)malloc(sizeof(int*)*m);
    for (int k = 0; k < m; k++)
        a[k] = (int*)malloc(sizeof(int)*n);
    for (int i = 0; i < m; i++)
    {
        for (int j = 0; j < n; j++)
            scanf("%d", &a[i][j]);
    }
    printf("\n");
    b = (int **)malloc(sizeof(int*)*m);
    for (int k = 0; k < m; k++)
        b[k] = (int*)malloc(sizeof(int)*n);
    for (int i = 0; i<m; i++)
    {
        for (int j = 0; j<n; j++)
            scanf("%d", &b[i][j]);
    }
    printf("\n");
    for (int i = 0; i<m; i++)
    {
        for (int j = 0; j<n; j++)
        {
            a[i][j] = a[i][j] - b[i][j];
            printf("%d ", a[i][j]);
        }
        printf("\n");
    }
    for (int i = 0; i < m; i++)
    {
        free(a[i]);
        free(b[i]);
    }
    free(a);
    free(b);
    system("pause");
    return 0;
}

#include<stdio.h>
int main()
{
    int a[200][200],b[200][200];
    int m, n;
    scanf_s("%d%d", &m, &n);
    for (int i = 0; i < m; ++i) {
        for (int j = 0; j < n; ++j)scanf_s("%d", &a[i][j]);
    }
    for (int i = 0; i < m; ++i) {
        for (int j = 0; j < n; ++j)scanf_s("%d", &b[i][j]);
    }
    for (int i = 0; i < m; ++i) {
        for (int j = 0; j < n; ++j)printf_s("%d ", a[i][j]-b[i][j]);
        printf_s("\n");
    }
    return 0;
}

题目解法很简单，金额有点高，是不是哪里有问题

#include<stdio.h>
int main()
{
    int a[100][100],b[100][100];
    int m, n;
    scanf("%d%d", &m, &n);
    for (int i = 0; i < m; ++i) {
        for (int j = 0; j < n; ++j)
            scanf("%d", &a[i][j]);
    }
    for (int i = 0; i < m; ++i) {
        for (int j = 0; j < n; ++j)
            scanf("%d", &b[i][j]);
    }

    for (int i = 0; i < m; ++i) {
        for (int j = 0; j < n; ++j)
            printf("%d ", a[i][j]-b[i][j]);
        printf("\n");
    }
}