delete pics to save space

history_source/信息学奥赛一本通/3.4.6.2.cpp

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+#include<cstdio>
+#include<algorithm>
+using namespace std;
+int m,n,t,fa[10005],k,maxn;
+struct node
+{
+	int a,b,v;
+};
+node a[10005];
+bool cmp(node a,node b)
+{
+	return a.v<b.v;
+}
+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;
+}
+void u(int a,int b)
+{
+	static int aa,bb;
+	aa=ff(a);
+	bb=ff(b);
+	k++;
+	fa[bb]=aa;
+}
+int main()
+{
+	freopen("city.in","r",stdin);
+	freopen("city.out","w",stdout);
+	scanf("%d%d",&n,&m);
+	printf("%d ",n-1);
+	for(int i=1;i<=n;i++) fa[i]=i;
+	for(int i=0;i<m;i++) scanf("%d%d%d",&a[i].a,&a[i].b,&a[i].v);
+	sort(a,a+m,cmp);
+	for(int i=0;k<n-1;i++)
+		if(ff(a[i].a)!=ff(a[i].b))
+		{
+			maxn=a[i].v;
+			u(a[i].a,a[i].b);
+		}
+	printf("%d\n",maxn);
+	return 0;
+}