Submission #516423

#	Time	Username	Problem	Language	Result	Execution time	Memory
516423		Ronin13	Easter Eggs (info1cup17_eastereggs)	C++14	100 / 100	21 ms	360 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"
#define ll long long
#define pb push_back
#define epb emplace_back
#define inf 1e9+1
#define linf 1e18+1
#define ull unsigned ll
#define f first
#define s second
#define pii pair<int,int>
using namespace std;

vector<vector<int> >g(513);
vector<int>vec;
int timer=0;

void dfs(int v,int e=-1){
    vec.pb(v);
    for(int to:g[v]){
        if(to==e)continue;
        dfs(to,v);
    }
}

int findEgg (int N, vector < pair < int, int > > bridges){
    for(int i=1;i<=N;i++)g[i].clear();
    vec.clear();
    for(pii x:bridges){
        int u=x.f,v=x.s;
        g[u].pb(v);
        g[v].pb(u);
    }
    dfs(1);
    int l=0,r=N;
    while(l+1<r){
        int mid=(l+r)/2;
        vector<int>q;
        for(int i=0;i<mid;i++)q.pb(vec[i]);
        if(query(q))r=mid;
        else l=mid;
    }
    return vec[r-1];
}

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