#include <bits/stdc++.h>
#include "grader.h"
#define f first
#define s second
using namespace std;
const int N=505;
int sz[N],par[N],fix[N],n,Egg[N],cnt,ind[N],timer,ans;
vector<int>v,V[N];
bool query(vector<int> v){
for(int i=0;i<v.size();i++){
if(Egg[v[i]]) return 1;
}
return 0;
}
int dfs(int u,int p){
timer++;
ind[timer]=u;
for(int i=0;i<V[u].size();i++){
if(V[u][i]==p) continue;
dfs(V[u][i],u);
}
}
int findEgg (int n1, vector < pair < int, int > > b)
{
n=n1;
for(int i=1;i<=n;i++)V[i].clear();
for(int i=0;i<b.size();i++){
V[b[i].f].push_back(b[i].s);
V[b[i].s].push_back(b[i].f);
}
dfs(1,0);
int l=1,r=n;
while(l<=r){
int mid=(l+r)/2;
v.clear();
for(int i=1;i<=mid;i++){
v.push_back(ind[i]);
}
if(query(v)){
ans=ind[mid];
r=mid-1;
}
else l=mid+1;
}
return ans;
}
int main(){
int e;
cin>>n>>e;
std::vector<pair<int,int> > b;
Egg[e]=1;
for(int k=2;k<=n;k++){
int u,v;
cin>>u>>v;
b.push_back({u,v});
}
cout<<findEgg(n,b)<<endl;
}
Compilation message
eastereggs.cpp:9:6: error: ambiguating new declaration of 'bool query(std::vector<int>)'
9 | bool query(vector<int> v){
| ^~~~~
In file included from eastereggs.cpp:2:
grader.h:6:5: note: old declaration 'int query(std::vector<int>)'
6 | int query(vector < int > islands);
| ^~~~~
eastereggs.cpp: In function 'bool query(std::vector<int>)':
eastereggs.cpp:10:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
10 | for(int i=0;i<v.size();i++){
| ~^~~~~~~~~
eastereggs.cpp: In function 'int dfs(int, int)':
eastereggs.cpp:18:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
18 | for(int i=0;i<V[u].size();i++){
| ~^~~~~~~~~~~~
eastereggs.cpp:22:1: warning: no return statement in function returning non-void [-Wreturn-type]
22 | }
| ^
eastereggs.cpp: In function 'int findEgg(int, std::vector<std::pair<int, int> >)':
eastereggs.cpp:27:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
27 | for(int i=0;i<b.size();i++){
| ~^~~~~~~~~
