#include <stdio.h>
#include <stdlib.h>
 
//必要があれば変数などを追加してもOKです
 
int main(){
    int i, j, k;
    int a, b;
    int **mat;
    scanf("%d %d", &a, &b);
 
    // ここで2次元配列の動的確保をする
    mat = (int **)malloc(a * sizeof(int *));
    for (i = 0; i < a; i++) {
        mat[i] = (int *)malloc(b * sizeof(int));
    }
 
    // ここで2次元配列に数値を代入する
    for (i = 0; i < a; i++) {
        for (j = 0; j < b; j++) {
            // ここでは例として、インデックスの和を代入します
            mat[i][j] = i + j;
        }
    }
 
    // 以下の部分は表示の部分です
    // いじらなくてOK
    for (i = 0; i < a; i++) {
        for (j = 0; j < b; j++) {
            printf("%d ", mat[i][j]);
        }
        printf("\n");
    }
 
    // 最後に忘れずにすること：動的に確保したメモリを解放する
    for (i = 0; i < a; i++) {
        free(mat[i]);
    }
    free(mat);
 
    return 0;
}
 

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