Submission #423012

#	Time	Username	Problem	Language	Result	Execution time	Memory
423012		albertolg101	Simurgh (IOI17_simurgh)	C++17	0 / 100	3052 ms	204 KiB

simurgh

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

using namespace std;
using pii = pair<int, int>;

void print (vector<int> &ar)
{
	for(auto i: ar)
		cout << i << ' ' ; 
	cout << endl ;
}

std::vector<int> find_roads(int n, std::vector<int> u, std::vector<int> v) {
	
	vector<vector<int>> g(n, vector<int> (n, -1));

	for(int i = 0 ; i < u.size() ; i++)
	{
		int a = u[i], b = v[i];
		g[a][b] = g[b][a] = i;
	}

	int nextNod = 0;
	vector<int> vans, perm(n);

	for(int i = 0 ; i < n ; i++)
		perm[i] = i;

	function<void(int)> dfs = [&](int nod)
	{
		nextNod++;

		//cout << nod << ' ' << perm[nextNod] << endl ;

		while(nextNod < perm.size() and g[nod][perm[nextNod]] != -1)
		{
			vans.push_back(g[nod][perm[nextNod]]);
			dfs(perm[nextNod]);
			//cout << nod << ' ' << perm[nextNod] << endl ;
		}
	};

	do
	{
		vans.clear();
		nextNod = 0;
		dfs(perm[0]);

		//print(perm);
		//cout << vans.size() << " - " ; 
		//print(vans);

		if(vans.size() == n - 1 and count_common_roads(vans) == n - 1)
			return vans;

	} while(next_permutation(perm.begin(), perm.end()));

	while(true);
}

Compilation message (stderr)

simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:18:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |  for(int i = 0 ; i < u.size() ; i++)
      |                  ~~^~~~~~~~~~
simurgh.cpp: In lambda function:
simurgh.cpp:36:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |   while(nextNod < perm.size() and g[nod][perm[nextNod]] != -1)
      |         ~~~~~~~~^~~~~~~~~~~~~
simurgh.cpp: In function 'std::vector<int> find_roads(int, std::vector<int>, std::vector<int>)':
simurgh.cpp:54:18: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   54 |   if(vans.size() == n - 1 and count_common_roads(vans) == n - 1)
      |      ~~~~~~~~~~~~^~~~~~~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 17
• Subtask 3: 0 / 21
• Subtask 4: 0 / 19
• Subtask 5: 0 / 30