delete pics to save space

history_source/信息学奥赛一本通/3.4.6.1.cpp

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+#include<cstdio>
+#include<algorithm>
+using namespace std;
+struct node{
+	int x,y,v;
+	bool operator<(node &b)
+	{return v<b.v;}
+};
+node a[1005];
+int fa[105],sum,minn,n,k,s,m;
+int ff(int x)
+{
+	static int t1,t2;
+	t1=x;
+	while(fa[x]!=x) x=fa[x];
+	while(t1!=x) t2=fa[t1],fa[t1]=x,t1=t2;
+	return x;
+}
+int main()
+{
+	freopen("net.in","r",stdin);
+	freopen("net.out","w",stdout);
+	scanf("%d%d",&n,&k);
+	for(int i=0;i<k;i++)
+	{
+		scanf("%d%d%d",&a[i].x,&a[i].y,&a[i].v);
+		sum+=a[i].v;
+	}
+	for(int i=1;i<=n;i++) fa[i]=i;
+	sort(a,a+k);
+	for(int i=0;s<n-1;i++)
+		if(ff(a[i].x)!=ff(a[i].y))
+		{
+			minn+=a[i].v;
+			fa[ff(a[i].y)]=ff(a[i].x);
+			s++;
+		}
+	printf("%d\n",sum-minn);
+	return 0;
+}