#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*));
     if (mat == NULL) {
        printf("Memory allocation failed.\n");
        return 1;
    }
 
	//ここで2次元配列に数値を代入する
	for(i=0;i<a;i++){
		mat[i]=(int*)malloc(b*sizeof(int));
		 if (mat == NULL) {
        printf("Memory allocation failed.\n");
        return 1;
		}
	}
 
    //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");
    }
 
    //さて，最後に忘れずにすることと言えば？
    for(i=0;i<a;i++){
    	free(mat[i]);
    }
    free(mat);
 
    return 0;
}
 

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

MiAzCg==

2 3