Submission #61620

#	Time	Username	Problem	Language	Result	Execution time	Memory
61620		Megumi_Tadokoro	Easter Eggs (info1cup17_eastereggs)	C++14	100 / 100	37 ms	700 KiB

eastereggs

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

const int N = 515;
vector <int> g[N], vertices, islands;

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

int findEgg(int N, vector<pair<int, int> > bridges) {
    int L = 1, R = N;
    for (int i = 1; i <= N; i++) g[i].clear();
    for (auto i: bridges) {
        g[i.first].push_back(i.second);
        g[i.second].push_back(i.first);
    }
    vertices.clear();

    dfs(1, 1);

    while(L < R) {
        int M = (L + R)/2;
        islands.clear();
        for (int i = 1; i <= M; i++) islands.push_back(vertices[i - 1]);

        if(query(islands)) R = M;
        else L = M+1;
    }

    return vertices[R - 1];
}

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