Submission #61550

#	Time	Username	Problem	Language	Result	Execution time	Memory
61550		FutymyClone	Easter Eggs (info1cup17_eastereggs)	C++14	0 / 100	5 ms	916 KiB

eastereggs

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

using namespace std;

const int N = 515;
vector <int> g[N], level[N];
int n, h[N];

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

        h[v] = h[u] + 1;
        dfs(v, u);
    }
}

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

    h[1] = 1;
    dfs(1, 1);

    int l = 1;
    int r = 0;
    for (int i = 1; i <= n; i++) r = max(r, h[i]);
    for (int i = 1; i <= n; i++) level[h[i]].push_back(i);
    vector <int> island, islands;

    while (l <= r) {
        int mid = (l + r) / 2;
        islands.clear();
        for (int i = 1; i <= mid; i++) {
            for (int v: level[i]) {
                islands.push_back(v);
            }
        }

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

    islands.clear();
    for (int i = 1; i <= l; i++) {
        for (int v: level[i]) {
            island.push_back(v);
        }
    }

    for (int v: island) {
        islands.push_back(v);
        if (query(islands)) return v;
        islands.clear();
    }
}

Compilation message (stderr)

eastereggs.cpp: In function 'int findEgg(int, std::vector<std::pair<int, int> >)':
eastereggs.cpp:60:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

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