제출 #1319747

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1319747		g31nius	Easter Eggs (info1cup17_eastereggs)	C++20	10 / 100	2 ms	488 KiB

eastereggs

#include <vector>
using namespace std;

int query(vector<int> islands);

vector<vector<int>> adj;
vector<int> subtree;

void dfs(int node, int parent) {
    subtree.push_back(node);
    for (int next : adj[node]) {
        if (next != parent) {
            dfs(next, node);
        }
    }
}

int findEgg(int N, vector<pair<int, int>> bridges) {
    adj.clear();
    subtree.clear();
    adj.assign(N + 1, vector<int>());
    for (auto& edge : bridges) {
        adj[edge.first].push_back(edge.second);
        adj[edge.second].push_back(edge.first);
    }
    
    int current = 1;
    int parent = -1;
    
    while (true) {
        bool foundInChild = false;
        
        for (int neighbor : adj[current]) {
            if (neighbor == parent) continue; 
            
            subtree.clear();
            dfs(neighbor, current);
            
            if (query(subtree) == 1) {
                parent = current;
                current = neighbor;
                foundInChild = true;
                break;
            }
        }
        
        if (!foundInChild) {
            return current;
        }
    }
}

• Subtask 1: 10 / 40
• Subtask 2: 0 / 40
• Subtask 3: 0 / 20