Submission #951890

#	Time	Username	Problem	Language	Result	Execution time	Memory
951890		__Davit__	Easter Eggs (info1cup17_eastereggs)	C++17	87 / 100	13 ms	1248 KiB

eastereggs

#include "grader.h"
#include <bits/stdc++.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) {
    gp.clear();
    gp.resize(N + 11);
    order.clear();
    for (pair<int, int> i: bridges) {
        gp[i.first].push_back(i.second);
        gp[i.second].push_back(i.first);
    }
    dfs(1);
    int ina = 1, inb = N, ans = order.back();
    while (ina <= inb) {
        int mid = (ina + inb) >> 1;
        vector<int> tmp;
        for (int i = 0; i < mid; i++) tmp.push_back(order[i]);
        if (query(tmp)) {
            inb = mid - 1;
            ans = tmp.back();
        } else ina = mid + 1;
    }
    return ans;
}

• Subtask 1: 32 / 40
• Subtask 2: 40 / 40
• Subtask 3: 15 / 20