Submission #1053964

#	Time	Username	Problem	Language	Result	Execution time	Memory
1053964		SulA	Easter Eggs (info1cup17_eastereggs)	C++17	0 / 100	127 ms	131072 KiB

eastereggs

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

vector<int> adj[513], preorder;

void dfs(int u = 1, int p = 0) {
    preorder.push_back(u);
    for (int ch : adj[u]) if (ch != p) dfs(ch, u);
}

int findEgg (int n, vector<pair<int,int>> bridges) {
    for (auto pair : bridges) {
        int u = pair.first, v = pair.second;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }

    dfs();
    int l = 0, r = n-1;
    while (r > l) {
        int mid = (l+r)/2;
        vector<int> myquery;
        for (int i = 0; i <= mid; i++) myquery.push_back(preorder[i]);
        bool res = query(myquery) == 1;
//        cout << "MY QUERY IS ";
//        for (int u : myquery) cout << u << " ";
//        cout << '\n';
        if (res) r = mid;
        else l = mid+1;
    }
    return preorder[l];
}

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