Submission #951870

#	Time	Username	Problem	Language	Result	Execution time	Memory
951870		__Davit__	Easter Eggs (info1cup17_eastereggs)	C++17	32 / 100	1 ms	600 KiB

eastereggs

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

using namespace std;

namespace {

    vector<int> order;
    vector<vector<int>> gp;

    void dfs(int u, int p = -1) {
        order.push_back(u);
        for (auto x: gp[u]) {
            if (x == p)continue;
            dfs(x, u);
        }
    }
}

int findEgg(int N, vector<pair<int, int> > bridges) {
    order.clear();
    gp.clear();
    gp.resize(N + 1);
    for (int i = 0; i < N; i++) {
        gp[bridges[i].first].push_back(bridges[i].second);
        swap(bridges[i].first, bridges[i].second);
        gp[bridges[i].first].push_back(bridges[i].second);
    }
    dfs(1);
    int ina = 1, inb = N, ans = N;
    while (ina <= inb) {
        int mid = (ina + inb) >> 1;
        vector<int> tmp;
        for (int i = 0; i < mid; i++)tmp.push_back(order[i]);
        bool ok = query(tmp);
        if (ok) {
            ans = mid;
            inb = mid - 1;
        } else {
            ina = mid + 1;
        }
    }

    return order[ans-1];
}

• Subtask 1: 32 / 40
• Subtask 2: 0 / 40
• Subtask 3: 0 / 20