Submission #1145949

#	Time	Username	Problem	Language	Result	Execution time	Memory
1145949		mitko7	Easter Eggs (info1cup17_eastereggs)	C++20	100 / 100	8 ms	1056 KiB

eastereggs

#include <bits/stdc++.h>
#include "grader.h"

using namespace std;

vector<int> g[1000];
vector<int> pre[1000];
vector<int> t;
bool preCalc = 0;
int used[1000];

void dfs(int i) {
    used[i]=1;
    t.push_back(i);
    for(auto x : g[i]) if(!used[x]) dfs(x);
}

int findEgg(int N, vector<pair<int, int>> bridges)
{
    for(auto x : bridges) {
        g[x.first].push_back(x.second);
        g[x.second].push_back(x.first);
    }
    dfs(1);
    if(!preCalc) {
        vector<int> q;
        for(int i = 0; i < N; i++) {
            q.push_back(t[i]);
            pre[i+1]=q;
        }
        preCalc=1;
    }
    int l = 1, r = N, m;
    while(l<r) {
        int m = (l+r)/2;
        if(query(pre[m])) {
            r = m;
        }
        else l=m+1;
    }

    for(int i = 0; i < 600; i++) {used[i]=0;g[i].clear();}
    t.clear();

    return t[l-1];
}

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