Submission #1139239

#	Time	Username	Problem	Language	Result	Execution time	Memory
1139239		Muhammet	Easter Eggs (info1cup17_eastereggs)	C++20	100 / 100	6 ms	524 KiB

eastereggs

#include "bits/stdc++.h"
#include "grader.h"
// #include "grader.cpp"

#define SZ(s) (int)s.size()
#define ss second
#define ff first

using namespace std;

vector <int> ve[513];

bool tr;

vector <int> path;

vector <pair<int,int>> v1;

void dfs(int x, int y){
    path.push_back(x);
    for(auto i : ve[x]){
        if(i == y) continue;
        dfs(i,x);
        path.push_back(x);
    }
}

int findEgg (int n, vector < pair < int, int > > briges) {
    map <int,bool> vis;
    if(!tr){
        tr = true;
        for(auto [i,j] : briges){
            ve[i].push_back(j);
            ve[j].push_back(i);
        }
        dfs(1,0);
        vis.clear();
        for(int i = 0; i < SZ(path); i++){
            if(vis.find(path[i]) == vis.end()) v1.push_back({path[i],i}), vis[path[i]] = true;
        }
    }
    int l = 0, r = SZ(v1)-1;
    while(l < r){
        int md = (l + r) / 2;
        vis.clear();
        vector <int> qwe;
        for(int i = v1[l].ss; i <= v1[md].ss; i++){
            if(vis.find(path[i]) == vis.end()) qwe.push_back(path[i]), vis[path[i]] = true;
        }
        bool qw = query(qwe);
        if(qw) r = md;
        else l = md+1;
    }
    return v1[l].ff;
}

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