Submission #1283447

#	Time	Username	Problem	Language	Result	Execution time	Memory
1283447		nathlol2	Easter Eggs (info1cup17_eastereggs)	C++20	100 / 100	9 ms	680 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
using namespace std;
vector<int> g[1000], t;
void dfs(int u, int p){
    t.push_back(u);
    for(auto v : g[u]) if(v != p) dfs(v, u);
}
int findEgg (int N, vector < pair < int, int > > e){
    for(int i = 0;i<1000;i++) g[i].clear();
    for(auto [u, v] : e){
        g[u].push_back(v);
        g[v].push_back(u);
    }
    dfs(1, -1);
    int l = 1, r = N, ans = -1;
    while(l <= r){
        if(l == N) return t[N - 1];
        int md = (l + r) / 2;
        vector<int> tmp;
        for(int i = 0;i<md;i++) tmp.push_back(t[i]);
        if(query(tmp)){
            ans = md;
            r = md - 1;
        }else{
            l = md + 1;
        }
    }
    return t[ans - 1];
}

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