Submission #802713

#	Time	Username	Problem	Language	Result	Execution time	Memory
802713		raysh07	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	16 ms	536 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
 
using namespace std;
 
int n;
const int maxn = 513;
vector <int> adj[maxn];
vector <int> ok;

void dfs(int u, int par = -1){
    ok.push_back(u);
    for (int v : adj[u]){
        if (v != par){
            dfs(v, u);
        }
    }
}
 
int findEgg (int N, vector <pair<int,int>> bridges)
{
    n = N;
    for (int i = 1; i <= n; i++) adj[i].clear();
    
    for (auto [u, v] : bridges){
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    
    dfs(1);
    
    int l = 0, r = n - 1;
    
    while (l != r){
        int mid = (l + r)/2;
        
        vector <int> lol;
        for (int i = 0; i <= mid; i++) lol.push_back(ok[i]);
        
        if (query(lol)) r = mid;
        else l = mid + 1;
    }
    
    return ok[l];
}

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