Submission #529692

#	Time	Username	Problem	Language	Result	Execution time	Memory
529692		ohohorz	Easter Eggs (info1cup17_eastereggs)	C++14	87 / 100	26 ms	500 KiB

eastereggs

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

using namespace std;

const int MAXN = 520;
set<int> g[MAXN];
int n;
vector<int> ord;

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



int findEgg (int N, vector < pair < int, int > > bridges){   
    /*
    set<int> g[MAXN];
int n, sub[MAXN];
vector<int> cenTree[MAXN], what[MAXN];
    */
   for(int i = 0;i <MAXN;i++){
       g[i].clear();
   }
   ord.clear();
    
    n = N;
    for(int i = 0;i < N-1;i++){
        int u = bridges[i].first;
        int v = bridges[i].second;
        g[u].insert(v);
        g[v].insert(u);
    }
    dfs(1, 0);
    int l = 0, r = n -1;
    int mx = 1e9;
    while(l <= r){
        int m = (l + r) >> 1LL;
        vector<int> to;
        for(int i = 0;i <= m;i++) to.push_back(ord[i]);
        int q = query(to);
        if(q == 1){
            mx = min(mx, m);
            r = m -1;
        } else l = m + 1;
    }
    
    return ord[mx];
}

• Subtask 1: 32 / 40
• Subtask 2: 40 / 40
• Subtask 3: 15 / 20