Submission #475697

#	Time	Username	Problem	Language	Result	Execution time	Memory
475697		lovrot	Easter Eggs (info1cup17_eastereggs)	C++11	Compilation error	0 ms	0 KiB

eastereggs

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

#define X first
#define Y second

using namespace std; 

vector<int> g[530];
vector<int> half;
vector<int> all; 
vector<int> help;

int have;
bool took[530];

bool query(vector< int > half);

void findHalf(int x){ 
	if(have == 0)
		return;

	took[x] = true;
	half.push_back(x);

	have--;
	for(int y : g[x]){ 
		if(took[y] == true) 
			continue;

		findHalf(y);
	}
}

int findEgg (int n, vector< pair< int, int > > graf ){ 
	memset(took, 0, sizeof(took));

	for(int i = 0; i <= n; i++)
		g[i].clear();

	for(int i = 0; i < n - 1; i++){ 
		int x = graf[i].X;
		int y = graf[i].Y;

		g[x].push_back(y);
		g[y].push_back(x);
	
		if(!took[x]){ 
			all.push_back(x);
			took[x] = true; 
		}
		if(!took[y]){ 
		 	all.push_back(y);
		 	took[y] = true;
		}
	}
	
	memset(took, false, sizeof(took));

	while(all.size() > 1){ 
		have = n / 2;
		half.clear();

		findHalf(all[0]);

		bool ans = query(half);

		if(ans){ 
			n /= 2;
		}
		else{ 
			n = n - n / 2;
		}

		help.clear();
		for(int x : all){ 
			if(took[x] == ans)
				help.push_back(x);
		}

		all.clear();
		for(int x : help){
			took[x] = false;
			all.push_back(x);
		}
	}

	return all[0];
}

Compilation message (stderr)

eastereggs.cpp:18:6: error: ambiguating new declaration of 'bool query(std::vector<int>)'
   18 | bool query(vector< int > half);
      |      ^~~~~
In file included from eastereggs.cpp:3:
grader.h:6:5: note: old declaration 'int query(std::vector<int>)'
    6 | int query(vector < int > islands);
      |     ^~~~~