Submission #551190

#	Time	Username	Problem	Language	Result	Execution time	Memory
551190		krit3379	Easter Eggs (info1cup17_eastereggs)	C++17	0 / 100	2 ms	464 KiB

eastereggs

#include<bits/stdc++.h>
using namespace std;
#include"grader.h"
#define N 1000

int id[N],sz;
vector<int> g[N];

void dfs(int s,int f){
    id[++sz]=s;
    for(auto x:g[s]){
        if(x==f)continue;
        dfs(x,s);
    }
}

int findEgg(int n, vector<pair<int,int>> edge){
    int i,l,r,mid,flag;
    for(i=1;i<=n;i++)g[i].clear();
    for(auto [a,b]:edge){
        g[a].push_back(b);
        g[b].push_back(a);
    }
    sz=0;
    dfs(1,0);
    vector<int> v;
    l=1,r=n;
    while(l<r){
        mid=(l+r)/2;
        for(i=1;i<=mid;i++)v.push_back(id[i]);
        flag=query(v);
        if(flag){
            for(i=1;i<=mid;i++)v.pop_back();
            r=mid;
        }
        else{
            l=mid+1;
        }
    }
    return id[r];
}

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