Submission #1220550

#	Time	Username	Problem	Language	Result	Execution time	Memory
1220550		takoshanava	Easter Eggs (info1cup17_eastereggs)	C++20	100 / 100	8 ms	504 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
#define pb push_back
#define fs first
#define sc second
using namespace std;

const int N = 520;
vector<int> in;
vector<int> adj[N];

void dfs(int v, int par){
    in.pb(v);
    for(auto u : adj[v]){
        if(u != par){
            dfs(u, v);
        }
    }
}

int findEgg(int n, vector<pair<int, int>> bridges){
    in.clear();
    for (int i = 1; i <= n; i++) adj[i].clear();

    for(auto v : bridges){
        adj[v.fs].pb(v.sc);
        adj[v.sc].pb(v.fs);
    }

    dfs(1, 0); 

    int l = 0, r = n - 2, ans = n - 1;
    while(l <= r){
        int mid = (l + r) / 2;
        vector<int> vec;
        for(int i = 0; i <= mid; i++){
            vec.push_back(in[i]);
        }

        if(query(vec)){
            ans = mid;
            r = mid - 1;
        } else {
            l = mid + 1;
        }
    }

    return in[ans];
}

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