Submission #522168

#	Time	Username	Problem	Language	Result	Execution time	Memory
522168		blue	Easter Eggs (info1cup17_eastereggs)	C++17	0 / 100	334 ms	131076 KiB

eastereggs

#include <vector>
#include "grader.h"
using namespace std;

using vi = vector<int>;
using pii = pair<int, int>;

const int p_mx = 512;

vi p_edge[1+p_mx];

vi p_ord(1, 0);

void dfs(int u, int p)
{
    p_ord.push_back(u);
    for(int v : p_edge[u])
    {
        if(v != p) 
            dfs(v, u);
    }
}


int findEgg (int N, vector < pair < int, int > > bridges)
{
    for(pii b: bridges)
    {
        p_edge[b.first].push_back(b.second);
        p_edge[b.second].push_back(b.first);
    }

    dfs(1, 0);

    int lo = 1, hi = N;
    while(lo != hi)
    {
        int mid = (lo+hi)/2;

        vi qr;
        for(int i = 1; i <= mid; i++)
            qr.push_back(p_ord[i]);

        if(query(qr))
            hi = mid;
        else
            lo = mid+1;
    }

    return p_ord[lo];
}

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