牛客多校赛四

 4. Chiaki has an n x n matrix. She would like to fill each entry by -1, 0 or 1 such that r1,r2,...,rn,c1,c2, ..., cn are distinct values, where ri be the sum of the i-th row and c i be the sum of the i-th column. 输入描述： There are multiple test cases. The first line of input contains an integer T (1 ≤ T ≤ 200), indicating the number of test cases. For each test case: The first line contains an integer n (1 ≤ n ≤ 200) -- the dimension of the matrix. 输出描述： For each test case, if no such matrix exists, output ``impossible'' in a single line. Otherwise, output ``possible'' in the first line. And each of the next n lines contains n integers, denoting the solution matrix. If there are multiple solutions, output any of them.

示例1: 输入 2 1 2

输出 impossible possible

1 0

1 -1

ss

#include<stdio.h>
int x[205][205]; 
int main()
{
	int n;
	scanf("%d",&n);
	while(n--)
	{
		int m;
		scanf("%d",&m);
		if(m%2==1)
		printf("impossible\n");
		else
		{
			printf("possible\n");
			for(int i=1;i<=m;i++)
			{       x[i][i]=1;
					for(int j=1;j<i;j++)
					{
						if(j%2==1)
						{
							x[i][j]=1;
							x[j][i]=1;
						}
						else
						{
							x[i][j]=-1;
							x[j][i]=-1;	
						}	
					}
				if(i%2==1)
				{
					x[i][i+1]=0;		
				}
				else
				{
					x[i][i]=-1;
					x[i-1][i]=0;
				}	
			}
		for(int i=1;i<=m;i++)
		{
			int j;
			for(j=1;j<m;j++)
			{
				printf("%d ",x[i][j]);
			}
			printf("%d\n",x[i][j]);
		}
		}

	}
 }