Submission #61591

#	Time	Username	Problem	Language	Result	Execution time	Memory
61591		FutymyClone	Easter Eggs (info1cup17_eastereggs)	C++14	100 / 100	35 ms	608 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"

using namespace std;

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

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) {
    n = N;
    vertices.clear();
    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);
    }

    dfs(1, 1);

    int l = 1;
    int r = n;

    vector <int> islands;
    while (l < r) {
        int mid = (l + r) / 2;
        islands.clear();
        for (int i = 1; i <= mid; i++) {
            islands.push_back(vertices[i - 1]);
        }

        if (query(islands)) r = mid;
        else l = mid + 1;
    }

    return vertices[r - 1];
}

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