// test code USACO Guide, https://usaco.guide/adv/interactive?lang=cpp
#include <bits/stdc++.h>
#include "grader.h"
using namespace std;
const int N = 600;
vector<int> graph[513], ord;
void dfs(int node = 1, int parent = 0) {
ord.push_back(node);
for (int i : graph[node]) if (i != parent) dfs(i, node);
}
int findEgg(int N, vector<pair<int, int>> bridges) {
for (int i = 1; i <= N; i++) graph[i].clear();
ord.clear();
for (pair<int, int> i : bridges) {
graph[i.first].push_back(i.second);
graph[i.second].push_back(i.first);
}
dfs();
int l = 0, r = N - 1;
while (l != r) {
int mid = (l + r + 1) / 2;
if (query(vector<int>(ord.begin(), ord.begin() + mid))) r = mid - 1;
else l = mid;
}
return ord[l];
}
