제출 #864301

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
864301		gutzzy	Easter Eggs (info1cup17_eastereggs)	C++14	0 / 100	1 ms	476 KiB

eastereggs

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

int findEgg(int n, vector<pair<int, int>>bridges){
    // vector 1D de todas las islas
    vector<vector<int>> lst(n,vector<int>());
    
    for(auto b:bridges){
        lst[b.first-1].push_back(b.second-1);
        lst[b.second-1].push_back(b.first-1);
    }
    
    vector<int> islands;
    
    int isl=0;
    while((int) lst[isl].size()!=1) isl++;          // busco un extremo
    
    
    islands.push_back(isl);
    int l_isl = isl;
    isl = lst[l_isl][0];
    islands.push_back(isl);
    
    while((int) islands.size() != n){
        int t = isl;
        if(lst[isl][0]==l_isl) isl = lst[isl][1];
        else isl = lst[isl][0];
        l_isl = t;
        islands.push_back(isl);
    }
    
    // binary search
    
    int l = 0;
    int r = n-1;
    while(l<=r){
        int m = (l+r)/2;
        bool egg = query({islands.begin()+l,islands.begin()+l+m});
        if(egg) r = m-1;
        else l = m+1;
    }
    return l;
}

• Subtask 1: 0 / 40
• Subtask 2: 0 / 40
• Subtask 3: 0 / 20