Submission #1195075

#	Time	Username	Problem	Language	Result	Execution time	Memory
1195075		Hamed_Ghaffari	Easter Eggs (info1cup17_eastereggs)	C++20	100 / 100	7 ms	504 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
using namespace std;

const int MXN = 513;

vector<int> g[MXN], ord;

void dfs(int v, int p=0) {
    ord.push_back(v);
    for(int u : g[v])
        if(u!=p)
            dfs(u, v);
}

bool imgoingbackto505;

int findEgg(int n, vector < pair < int, int > > bridges)
{
    if(!imgoingbackto505) {
        for(int i=0; i<n-1; i++) {
            g[bridges[i].first].push_back(bridges[i].second);
            g[bridges[i].second].push_back(bridges[i].first);
        }
        dfs(1);
        imgoingbackto505 = 1;
    }
    int l=-1, r=n-1;
    while(r-l>1) {
        int mid = l+r>>1;
        vector<int> vec;
        for(int i=0; i<=mid; i++)
            vec.push_back(ord[i]);
        (query(vec) ? r : l) = mid;
    }
    return ord[r];
}

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