delete pics to save space

1.1196.cpp

@@ -0,0 +1,44 @@
+#include<cstdio>
+#include<cstring>
+#include<algorithm>
+using namespace std;
+const int maxn=30005;
+int M,fa[maxn],d[maxn],sz[maxn];
+inline int ff(int u)
+{
+	int a=u,b,c=0;
+	while(u!=fa[u]) c+=d[u],u=fa[u];
+	while(a!=u)
+	{
+		b=fa[a];
+		c-=d[a];
+		d[a]+=c;
+		fa[a]=u;
+		a=b;
+	}
+	return u;
+}
+inline void merge(int x,int y)
+{
+	x=ff(x); y=ff(y);
+	fa[x]=y; d[x]=sz[y]; sz[y]+=sz[x];
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d",&M);
+	for(int i=1;i<=30000;i++) fa[i]=i,sz[i]=1;
+	while(M-->0)
+	{
+		char op; int x,y; scanf("%s %d %d",&op,&x,&y);
+		if(op=='M') merge(x,y);
+		else
+		{
+			if(ff(x)!=ff(y)) puts("-1");
+			else printf("%d\n",abs(d[x]-d[y])-1);
+		}
+	}
+	return 0;
+}