Submission #1030239

#	Time	Username	Problem	Language	Result	Execution time	Memory
1030239		ender	Arranging Shoes (IOI19_shoes)	C++17	0 / 100	1 ms	348 KiB

shoes

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

using namespace std;

long long count_swaps(std::vector<int> s) {

	int n = s.size()/2;
	vector<int> p;
	for(int i = 1; i <= n; ++i) p.push_back(i);
	long long ans = 1e18;

	do{

		long long cnt = 0;
		vector<int> curr; // same size as s
		for(int i = 0; i < n; ++i){
			curr.push_back(-p[i]);
			curr.push_back(p[i]);

		}

		for(int i = 0; i < s.size(); ++i){

		if(i%2 == 0){ // debe ser zapato izquierdo

			if(s[i] == curr[i]) continue;

			for(int j = i+1; j < s.size(); ++j){

				if(s[j] == curr[i]){

					for(int k = j; k > i; --k){

						swap(s[k], s[k-1]);
						cnt++;

					}

					break;

				}

			}

		}else { // debe ser zapato derecho

			if(s[i] == s[i-1] * -1) continue;

			int target = s[i-1] * -1;

			cout << s[i] << " " << target << " " << curr[i] << "\n";

			for(int j = i+1; j < s.size(); ++j){

				if(s[j] == target){

					for(int k = j; k > i; --k){

						swap(s[k], s[k-1]);
						cnt++;

					}

					break;

				}

			}


		}

	}

	ans = min(cnt, ans);

	for(const auto &i : s ) cout << i << " ";
	cout << "\n";

	cout << ans << "\n";


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

	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:23:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |   for(int i = 0; i < s.size(); ++i){
      |                  ~~^~~~~~~~~~
shoes.cpp:29:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |    for(int j = i+1; j < s.size(); ++j){
      |                     ~~^~~~~~~~~~
shoes.cpp:54:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |    for(int j = i+1; j < s.size(); ++j){
      |                     ~~^~~~~~~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15