ADb9ZX - Online C Compiler & Debugging Tool

#include <stdio.h>
#include <stdlib.h>

int main() {
    int a, b;
    scanf("%d %d", &a, &b);
    int **mat = (int **)malloc(a * sizeof(int *));
    for (int i = 0; i < a; i++) {
        mat[i] = (int *)malloc(b * sizeof(int));
    }

    int num = 1;
    for (int i = 0; i < a; i++) {
        for (int j = 0; j < b; j++) {
            mat[i][j] = num++;
        }
    }
    for (int i = 0; i < a; i++) {
        for (int j = 0; j < b; j++) {
            printf("%d ", mat[i][j]);
        }
        printf("\n");
    }
    for (int i = 0; i < a; i++) free(mat[i]);
    free(mat);

    return 0;
}