#include<algorithm>
#include<iostream>
#include<cstring>
#include<cstdlib>
#include<cstdio>
using namespace std;
#define inf 1000000000
inline int read(){
int x=0,f=1;char ch=getchar();
while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
while(ch>='0'&&ch<='9'){x=x*10+ch-'0';ch=getchar();}
return x*f;
}
const int maxn=50001;
int n,ans,sz,rt,t1,t2,c[maxn][2],fa[maxn],num[maxn];
inline void rotate(int x,int &k){
int y=f......
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