Submission #990292

#	Time	Username	Problem	Language	Result	Execution time	Memory
990292		xnqs	Easter Eggs (info1cup17_eastereggs)	C++17	100 / 100	14 ms	592 KiB

eastereggs

// omfg why would you use namespace std in a header file like are you ok?????????
// bro why the fuck are you segfaultingggg

#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
#include <utility>
#include <algorithm>
//#include "grader.h"

int findEgg(int n, std::vector<std::pair<int,int>> bridges);
int query(std::vector<int> islands);

void dfs(int k, int p, const std::vector<int>* adj_list, std::vector<int>& tour) {
	tour.emplace_back(k);
	for (const auto& i : adj_list[k]) {
		if (i!=p) {
			dfs(i,k,adj_list,tour);
		}
	}
}

int findEgg(int n, std::vector<std::pair<int,int>> bridges) {
	// these testcases are actually fucking retarded, nodes can go above n, like that makes no sense and it's not mentioned in the statement
	// bs problem, average info1cup experience
	std::vector<int> adj_list[513];
	std::vector<int> tour;
	int gs = n;
	for (int i = 0; i < 513; i++) {
		adj_list[i].clear();
	}
	tour.clear();
	for (const auto& [a, b] : bridges) {
		adj_list[a].emplace_back(b);
		adj_list[b].emplace_back(a);
	}
		
	dfs(1,0,adj_list,tour);

	int l = 0, r = tour.size()-1;
	int ret = 0;
	while (l!=r) {
		int m = (l+r+1)/2;
		if (query(std::vector<int>(tour.begin(),tour.begin()+m))) {
			r = m-1;
		}
		else {
			l = m;
		}
	}

	ret = tour[l];
	return ret;
}

Compilation message (stderr)

eastereggs.cpp: In function 'int findEgg(int, std::vector<std::pair<int, int> >)':
eastereggs.cpp:29:6: warning: unused variable 'gs' [-Wunused-variable]
   29 |  int gs = n;
      |      ^~

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