@[My_Xuan](/user/679265) 改两个地方：
```
#include <bits/stdc++.h>
using namespace std;
int f[5005], n, m, ans, x, y, cnt;
struct eg { int u, v, w; }
a[200005];
bool cmp (eg a, eg b) { return a.w < b.w; }
int find (int x)
{
if (f[x] != x) return f[x] = find (f[x]);//here
return x;
}
int main ( )
{
ios :: sync_with_stdio (0); cin.tie (0);
//here
cin >> n >> m;for (int i = 1; i <= n; i++) f[i] = i;
for (int i = 1; i <= m; i++)
cin >> a[i].u >> a[i].v >> a[i].w;
sort (a + 1, a + m + 1, cmp);
for (int i = 1; i <= m; i++)
{
x = find (a[i].u), y = find (a[i].v);
if (x == y) continue;
ans += a[i].w, f[y] = x, cnt++;
if (cnt == n - 1) {cout << ans; return 0;}
}
cout << "orz";
return 0;
}
```
by Tryst @ 2023-08-10 23:09:18