제출 #1097316

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1097316		bvv23	Easter Eggs (info1cup17_eastereggs)	C++14	100 / 100	16 ms	600 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
 
using namespace std;
const int N = 600 + 7;
vector <int> g[N];
vector <int> path;
 
void dfs(int node, int p = - 1) {
    path.push_back(node);
    for (auto v : g[node]) {
        if (v != p) {
            dfs(v, node);
        }
    }
}
int findEgg (int n, vector <pair<int, int >> edges)
{
    path.clear();
    for (int i = 0; i <= n; i++) {
        g[i].clear();
    }
    for (auto v : edges) {
        g[v.first].push_back(v.second);
        g[v.second].push_back(v.first);
    }
    dfs(1);
    int l = 0, r = n - 2;
    // if this current path is ok, then look for more min answer
    int ans = path.back();
    vector <int> lst;
    while (l <= r) {
        int mid = (l + r) >> 1;
        lst.clear();
        for (int i = 0; i <= mid; i++) {
            lst.push_back(path[i]);
        }
        if (query(lst)) {
            r = mid - 1;
            ans = lst.back();
        }
        else {
            l = mid + 1;
        }
    }
    return ans;
}

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