Submission #1164729

#	Time	Username	Problem	Language	Result	Execution time	Memory
1164729		adaawf	Easter Eggs (info1cup17_eastereggs)	C++20	100 / 100	8 ms	508 KiB

eastereggs

#include <iostream>
#include <vector>
#include "grader.h"
using namespace std;
vector<int> g[555];
int dd[555], z = 0, b[555];
void dfs(int x, int p) {
    dd[x] = ++z;
    b[z] = x;
    for (int w : g[x]) {
        if (w == p) continue;
        dfs(w, x);
    }
}
int findEgg(int n, vector<pair<int, int>> e) {
    for (int i = 1; i <= n; i++) g[i].clear();
    z = 0;
    for (int i = 0; i < n - 1; i++) {
        g[e[i].first].push_back(e[i].second);
        g[e[i].second].push_back(e[i].first);
    }
    dfs(1, -1);
    int l = 1, r = n, res;
    while (l < r) {
        int mid = (l + r) >> 1;
        vector<int> v;
        for (int i = 1; i <= mid; i++) {
            v.push_back(b[i]);
        }
        if (query(v)) {
            r = mid;
        }
        else l = mid + 1;
    }
    return b[l];
}

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