RT，本地和IDE测第一个测试点的数据都输出"No Solution"（已下载测评数据，是正确答案），但是显示WA。有人能帮忙看看是真的吗？（附代码及提交记录）

#include<bits/stdc++.h>
#define ll long long
#define INF 0x7f7f7f7f
#define lowbit(x) x & -x
#define re register

using namespace std;

int read()
{
	bool k=0;
	int w=0;
	char c=getchar();
	while ((c<'0'||c>'9')&&c!='-')
		c=getchar();
	if (c=='-')
	{
		k=1;
		c=getchar();
 	}
	while (c>='0'&&c<='9')
	{
		w=(w<<3)+(w<<1)+c-'0';
		c=getchar();
	}
	return k?-w:w;
}

int n;
int maxn;
double t;
double a[102][102];
int i,j,k;

signed main()
{
	
	n=read();
	for (i=1;i<=n;i++)
		for (j=1;j<=n+1;j++)
			scanf("%lf",&a[i][j]);
	for (i=1;i<=n;i++)
	{
		maxn=i;
		for (j=i+1;j<=n;j++)
			maxn=(fabs(a[j][i])>fabs(a[maxn][i]))?j:maxn;
		for (j=1;j<=n+1;j++)
			swap(a[i][j],a[maxn][j]);
		if (a[i][i]==0)
		{
			printf("No Solution");
			return 0;
		}
		for (j=1;j<=n;j++)
			if (j!=i)
			{
				t=a[j][i]/a[i][i];
				for (k=i+1;k<=n+1;k++)
					a[j][k]-=a[i][k]*t;
			}
	}
	for (i=1;i<=n;i++)
		printf("%.2f\n",a[i][n+1]/a[i][i]);
	return 0;
}