Submission #330617

#	Time	Username	Problem	Language	Result	Execution time	Memory
330617		jovan_b	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	28 ms	1020 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"

using namespace std;

vector <int> ord;
vector <int> graf[20005];

void dfs(int v, int par){
    ord.push_back(v);
    for(auto c : graf[v]){
        if(c != par) dfs(c, v);
    }
}

int kveri(int x){
    vector <int> qq;
    for(int i=1; i<=x; i++) qq.push_back(ord[i]);
    return query(qq);
}

int findEgg (int N, vector < pair < int, int > > bridges)
{
    for(int i=1; i<=N; i++) graf[i].clear();
    ord.clear();
    ord.push_back(0);
    for(auto c : bridges){
        graf[c.first].push_back(c.second);
        graf[c.second].push_back(c.first);
    }
    dfs(1, 0);
    int l = 1, r = N;
    while(l < r){
        int mid = (l+r)/2;
        if(kveri(mid)){
            r = mid;
        }
        else l = mid+1;
    }
    return ord[l];
}

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