제출 #464808

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
464808		okaragul	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	23 ms	352 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
using namespace std;

vector<vector<int>> g;
vector<int> ord;

void dfs(int v, int p){
    ord.push_back(v);
    for(auto &ch:g[v]) if(ch!=p) dfs(ch, v);
}

int findEgg (int N, vector < pair < int, int > > bridges)
{
    g.assign(N, vector<int>()); ord.clear();
    for(int i = 0; i < N-1; i++){
        auto &[a, b]=bridges[i];
        g[a-1].push_back(b-1);
        g[b-1].push_back(a-1);
    }
    dfs(0, -1);
    int l=1, r=N;
    while(l<r){
        int mid=(l+r)/2;
        
        vector<int> tmp;
        for(int i = 0; i < mid; i++) tmp.push_back(ord[i]+1);

        if(!query(tmp)) l=mid+1;
        else r=mid;
    }
    return ord[l-1]+1;
}

• Subtask 1: 40 / 40
• Subtask 2: 40 / 40
• Subtask 3: 20 / 20