QNDMX，连矩阵树都会了
by 神山识 @ 2020-01-23 19:41:10
膜 zdy
by Aestas16 @ 2020-01-23 19:43:02
@[我不是箭毒蛙](/user/238572) 会矩阵树不会高消？/jk
by kkksx @ 2020-01-23 19:47:12
@[御坂20001号](/user/115482) 不是，窝看了矩阵树发现我不会高斯消元就回来学（
by GIFBMP @ 2020-01-23 19:48:12
```
double k=a[i][i];
for(int j=1;j<=n+1;j++)
a[i][j]=a[i][j]/k;
for(int j=1;j<=n;j++)
if(i!=j)
for(int l=1;l<=n+1;l++)
a[j][l]=a[j][l]-(a[j][i]*a[i][l]);
}
for(int i=1;i<=n;i++)
printf("%.2lf\n",a[i][n+1]);
```
这里貌似有问题
by Silent_E @ 2020-01-23 19:52:48
试试这样？
```
for (int j = 1;j <= n; ++j) {
if (i == j) continue;
double rate = a[j][i] / a[i][i];
for (int k = 1;k <= n + 1; ++k) {
a[j][k] -= rate * a[i][k];
}
}
}
for(int i=1;i<=n;i++)
printf("%.2lf\n",a[i][n + 1]/a[i][i]);
```
by Silent_E @ 2020-01-23 19:56:32
@[Silent_E](/user/111674) 谢谢，过了QwQ
by GIFBMP @ 2020-01-23 20:04:08