Submission #1321677

#	Time	Username	Problem	Language	Result	Execution time	Memory
1321677		Zone_zonee	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	8 ms	500 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
using namespace std;
const int Nx = 600;

vector<int> adj[600], val;
void dfs(int u, int p){
    val.push_back(u);
    for(auto v : adj[u]){
        if(p == v) continue;
        dfs(v, u);
    }
}
int findEgg (int N, vector<pair<int, int>> bridges)
{
    for(int i = 1; i <= N; ++i) adj[i].clear();
    val.clear();
    val.push_back(-1);
    for(auto [u, v] : bridges){
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    dfs(1, -1);
    int l = 1, r = N;
    while(l < r){
        int mid = (l+r)>>1;
        vector<int> Q;
        for(int i = 1; i <= mid; ++i) Q.push_back(val[i]);
        if(query(Q)) r = mid;
        else l = mid+1;
    }
    return val[l];
}

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