//*** Bismillah ***//
#pragma GCC optimize("O3", "fast-math", "unroll-loops", "no-stack-protector")
#include <bits/stdc++.h>
using namespace std;
#if !defined(ONLINE_JUDGE) and !defined(EVAL)
#include "template/debug.h"
#else
#define d(x...)
#endif
#define fr first
#define er erase
#define sc second
#define in insert
#define ll long long
#define pb push_back
#define vll vector<ll>
#define pll pair<ll,ll>
#define ull unsigned ll
#define vpll vector<pll>
#define len(x) (ll) x.size()
#define all(x) x.begin(),x.end()
const ll INF = 1e9;
const ll INFL = 1e18;
const ll MOD = 1e9+7;
// const ll MOD = 998244353;
const ll maxn = 600+5;
ll n,m,k=0;
#include "grader.h"
ll cv, mxd;
vll g[maxn];
vector<int> ch[maxn];
bitset<maxn>bt;
void prep(ll u, ll p = -1, ll dep = 1){
mxd = max(mxd, dep);
ch[u].pb(u);
for(auto v : g[u]){
if(v == p) continue;
prep(v, u, dep + 1);
for(auto x : ch[v]) ch[u].pb(x);
}
}
ll dfs(ll u, ll p, ll dep){
if(dep == 1){
if(query(ch[u])){
cv = u;
return 1;
}
bt[u] = 1;
return 0;
}
for(auto v : g[u]){
if(v == p) continue;
if(bt[v]) continue;
if(dfs(v, u, dep - 1)){
return 1;
}
}
return 0;
}
int findEgg(int _n, vector<pair<int, int>>_g){
n = _n;
for(ll i = 1; i <= n; i ++){
g[i].clear(), ch[i].clear();
}
bt.reset();
for(auto [x, y] : _g){
g[x].pb(y);
g[y].pb(x);
}
mxd = 0;
prep(1);
ll l = 1, r = mxd;
while(l <= r){
ll md = (l + r) >> 1;
if(dfs(1, -1, md)){
l = md + 1;
}
else{
r = md - 1;
}
}
return cv;
}
// void _(ll &tt){
// }
// signed main() {
// ll tm = clock();
// cin.tie(0)->sync_with_stdio(0);
// ll t = 1;
// cin >> t;
// for(ll tt = 1; tt <= t; tt ++) {
// _(tt);
// }
// cerr << "\n\033[1;31mTime: \033[1;30m" \
// << (double)(clock()-tm)/1000000 << "\033[1;32m seconds\n";
// }
