和@[chenweizhen](/user/676569) 错的一样
by Special_Tony @ 2024-03-13 12:50:34
难道被卡精度了？？
by Special_Tony @ 2024-03-13 12:51:50
upd:高精度还WA
```cpp
# include <bits/stdc++.h>
# define ffor(i,name) \
for (auto i = name.begin (); i != name.end (); ++ i)
using namespace std;
typedef long long ll;
typedef pair <int, int> pii;
const double eps = 1e-7;
int n, sum, now = 1, maxi;
double a[105][105], mul;
int main () {
// ios::sync_with_stdio (0);
//
// cin.tie (0);
//
// cout.tie (0);
cin >> n;
++ n;
for (int i = 1; i < n; ++ i)
for (int j = 1; j <= n; ++ j)
cin >> a[i][j];
for (int i = 1; i < n; ++ i) {
maxi = now;
for (int j = now + 1; j < n; ++ j)
if (fabs (a[j][now]) > fabs (a[maxi][now]))
maxi = j;
if (fabs (a[maxi][i]) <= eps)
continue ;
swap (a[maxi], a[now]);
for (int j = 1; j < n; ++ j)
if (j != now) {
mul = a[j][i] / a[now][i];
for (int k = i + 1; k <= n; ++ k)
a[j][k] -= mul * a[now][k];
}
++ now;
}
if (now >= n)
for (int i = 1; i < n; ++ i)
printf ("x%d=%.2lf\n", i, a[i][n] / a[i][i]);
else {
for (int i = now; i < n; ++ i)
if (fabs (a[i][n]) > eps) {
puts ("-1");
return 0;
}
putchar ('0');
}
return 0;
}
/*
3
1 1 3 4
2 2 3 1
2 1 1 1
*/
```
by Special_Tony @ 2024-03-13 13:18:31
@[Special_Tony](/user/743373) 我测的你的代码……
by chenweizhen @ 2024-03-13 17:34:00
@[chenweizhen](/user/676569) 6，那您最后咋改AC的
by Special_Tony @ 2024-03-13 21:06:11
也和@[lanjiarui](/user/736259) 一样
by Special_Tony @ 2024-03-13 21:13:07
@[Special_Tony](/user/743373) 我用的原来AC的
by chenweizhen @ 2024-03-14 16:52:08