题干：
This is a super simple problem. The description is simple, the solution is simple. If you believe so, just read it on. Or if you don't, just pretend that you can't see this one.
We say an element is inside a matrix if it has four neighboring elements in the matrix (Those at the corner have two and on the edge have three). An element inside a matrix is called "nice" when its value equals the sum of its four neighbors. A matrix is called "k-nice" if and only if k of the elements inside the matrix are "nice".
Now given the size of the matrix and the value of k, you are to output any one of the "k-nice" matrix of the given size. It is guaranteed that there is always a solution to every test case.
Input
The first line of the input contains an integer T (1 <= T <= 8500) followed by Ttest cases. Each case contains three integers n, m, k (2 <= n, m <= 15, 0 <= k <= (n- 2) * (m - 2)) indicating the matrix size n * m and it the "nice"-degree k.
Output
For each test case, output a matrix with n lines each containing m elements separated by a space (no extra space at the end of the line). The absolute value of the elements in the matrix should not be greater than 10000.
Sample Input
2 4 5 3 5 5 3
Sample Output
2 1 3 1 1 4 8 2 6 1 1 1 9 2 9 2 2 4 4 3 0 1 2 3 0 0 4 5 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
题目大意：
构造出一个含k个nice的n*m的矩阵。nice：周围4个数字之和等于该数字（边缘的数字不属于，因为周围没有4个数字）。
解题报告：
第一个样例一点提示性都没有，但是看到第二个样例就明白了，可以全填0，这样是构造了一个满k的矩阵，然后再依次填数就可以了。填一个数，k就变小了1.
AC代码：
#include<cstdio>
#include<iostream>
#include<algorithm>
#include<queue>
#include<map>
#include<vector>
#include<set>
#include<string>
#include<cmath>
#include<cstring>
#define ll long long
#define pb push_back
#define pm make_pair
using namespace std;
const int MAX = 200 + 5;
int a[MAX][MAX];
int main()
{int t;cin>>t;while(t--) {int m,n,k;scanf("%d%d%d",&n,&m,&k);memset(a,0,sizeof a);k = (n-2)*(m-2) - k;int cur = 0;for(int i = 1; i<=n; i++) {for(int j = 2; j<=m-1; j++) {if(cur < k) a[i][j] = ++cur;}}for(int i = 1; i<=n; i++) {for(int j = 1; j<=m; j++) {printf("%d%c",a[i][j],j == m ? '\n' : ' ');}}}return 0 ;
}
