Submission #1178288

#	Time	Username	Problem	Language	Result	Execution time	Memory
1178288		perchuts	Easter Eggs (info1cup17_eastereggs)	C++20	0 / 100	0 ms	508 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
#define all(x) x.begin(), x.end()
#define sz(x) (int) x.size()
#define endl '\n'
#define pb push_back
#define _ ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);

using namespace std;

using ll = long long;
using ull = unsigned long long;
using ii = pair<int,int>;
using iii = tuple<int,int,int>;

const int inf = 2e9+1;
const int mod = 1e9+7;
const int maxn = 3e5+100;

template<typename X, typename Y> bool ckmin(X& x, const Y& y) { return (y < x) ? (x=y,1):0; }
template<typename X, typename Y> bool ckmax(X& x, const Y& y) { return (x < y) ? (x=y,1):0; }

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());


int findEgg(int n, vector<ii> edg) {
    vector<vector<int>> g(n+1);
    for (auto [x, y] : edg) g[x].pb(y), g[y].pb(x);
    vector<int> in(19*n+1);
    int tt = 0;
    auto dfs = [&] (auto&& self, int u, int p) -> void {
        in[++tt] = u;
        for (auto v : g[u]) {
            if (v == p) continue;
            self(self, v, u);
        }
    };
    dfs(dfs, 1, 1);
    int l = 1, r = n, ans = n;
    while (l <= r) {
        int md = l + (r-l+1)/2;
        vector<int> qq;
        for (int i = 1; i <= md; ++i) qq.pb(in[i]);
        if (query(qq)) ans = md, l = md+1;
        else r = md-1;
    }
    return in[ans];
}

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