Submission #1146006

#	Time	Username	Problem	Language	Result	Execution time	Memory
1146006		sonya	Easter Eggs (info1cup17_eastereggs)	C++20	100 / 100	8 ms	508 KiB

eastereggs

#include <iostream>
#include <vector>
#include <queue>
#include "grader.h"
using namespace std;

vector<int> t;
int used[513];
int mid;
vector<int> v[513];

int check_(int x){
    vector<int> p;
    for(int i = 0; i <= x; i++){
        p.push_back(t[i]);
    }

    return query(p);
}

void dfs(int beg){
    used[beg] = 1;
    t.push_back(beg);
    for(int i = 0; i < v[beg].size(); i++){
        int nb = v[beg][i];
        if(!used[nb]){
            dfs(nb);
        }
    }
}

void read(vector < pair < int, int > > bridges){
    for(int i = 0; i < bridges.size(); i++){
        v[bridges[i].first].push_back(bridges[i].second);
        v[bridges[i].second].push_back(bridges[i].first);
    }
}

int findEgg(int N, vector < pair < int, int > > bridges){
    t.clear();
    memset(used, 0, sizeof(used));
    for(int i = 1; i <= 513; i++){
        v[i].clear();
    }
    read(bridges);
    dfs(1);
    int l = 0;
    int r = t.size()-1;
    while(l < r){
        mid = (l+r)/2;
        if(check_(mid) == 1){
            r = mid;
        } else {
            l = mid+1;
        }
    }

    return t[l];
}

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