65 lines
1.3 KiB
C++
65 lines
1.3 KiB
C++
#include <iostream>
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#include <cstdio>
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#include <memory.h>
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#include <algorithm>
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using namespace std;
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const int maxn = 1002;
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const int maxm = 500002;
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struct node
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{
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int u,v,w,d;
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bool operator < (const node &other) const
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{
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return w > other.w;
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}
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}edge[maxm];
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int father[maxn];
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bool vis[maxn];
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int m,n;
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int find(int u)
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{
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return (u == father[u]) ? father[u] : (father[u] = find(father[u]));
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}
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void read()
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{
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memset(vis,false,sizeof(vis));
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for(int i=1;i<=n;i++) father[i] = i;
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for(int i=0;i<m;i++)
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{
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scanf("%d %d %d %d",&edge[i].u,&edge[i].v,&edge[i].d,&edge[i].w);
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}
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sort(edge , edge + m);
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return;
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}
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void solve()
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{
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int sum = 0;
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for(int i=0;i<m;i++)
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{
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int x = find(edge[i].u);
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int y = find(edge[i].v);
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if(vis[x] && vis[y]) continue;
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if(edge[i].d == 1 && vis[x]) continue;
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sum += edge[i].w;
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if(edge[i].d == 1) vis[x] = true;
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else
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{
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if(x == y) vis[x] = true;
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else if(vis[x]) vis[y] = true;
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else if(vis[y]) vis[x] = true;
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else father[y] = x;
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}
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}
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printf("%d\n",sum);
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return;
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}
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int main()
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{
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while(~scanf("%d %d",&n,&m))
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{
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read();
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solve();
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}
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return 0;
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}
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