Submission #835618

#	Time	Username	Problem	Language	Result	Execution time	Memory
835618		VMaksimoski008	Easter Eggs (info1cup17_eastereggs)	C++14	0 / 100	1 ms	464 KiB

eastereggs

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

vector<vector<int> > graph;
vector<int> euler;

void dfs(int u, int p) {
    euler.push_back(u);
    for(int &v : graph[u]) {
        if(v == p) continue;
        dfs(v, u);
    }
}

int findEgg(int n, vector<pair<int, int> > edges) {
    graph.clear();
    euler.clear();
    graph.resize(n+1);
    for(auto &x : edges) {
        graph[x.first].push_back(x.second);
        graph[x.second].push_back(x.first);
    }

    dfs(1, 0);
    int l=0, r=n-1;
    int ans = 0;

    while(l <= r) {
        int mid = (l + r) / 2; 
        vector<int> to_query(euler.begin(), euler.begin() + mid + 1);

        if(l == r) {
            ans = 0;
            break;
        }

        if(query(to_query)) {
            ans = mid;
            r = mid - 1;
        } else l = mid + 1;
    }

    return euler.back();
}

Compilation message (stderr)

eastereggs.cpp: In function 'int findEgg(int, std::vector<std::pair<int, int> >)':
eastereggs.cpp:27:9: warning: variable 'ans' set but not used [-Wunused-but-set-variable]
   27 |     int ans = 0;
      |         ^~~

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