解题关键

   for(int i =1;i<=n;i++){//行遍历
        //放大行
        for(int j = 1;j<=k;j++){
            for(int kk =1;kk <= m;kk++){//列遍历
                //放大列
                for(int l  =1;l<=k;l++){
                    cout << a[i][kk];
                }
            }
            cout << endl;
        }

    }