Submission #465877

#	Time	Username	Problem	Language	Result	Execution time	Memory
465877		dattranxxx	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	1087 ms	3112 KiB

shoes

/*
 * Author :  shora
 */
#include "shoes.h"
#include <bits/stdc++.h>
#define print(_v) for (auto &_ : _v) {cerr << _ << ' ';} cerr << endl;
using namespace std;
using ll = long long;
const int oo = 1e9;
ll n;

namespace task_5 {
	ll solve(vector<int>& a) {
		ll res = 0;
		for (int i = 0; i < a.size(); i += 2) {
			int j = find(a.begin() + i + 1, a.end(), -a[i]) - a.begin();
			int lim = a[i] < 0 ? j-i-1 : j-i;
			for (int k = 0; k < lim; ++k) {
				swap(a[j], a[j-1]); j--;
			}
			res += lim;
		}
		return res;
	}
}

long long count_swaps(std::vector<int> a) {
	n = a.size() / 2;
	return task_5::solve(a);
}

Compilation message (stderr)

shoes.cpp: In function 'll task_5::solve(std::vector<int>&)':
shoes.cpp:15:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |   for (int i = 0; i < a.size(); i += 2) {
      |                   ~~^~~~~~~~~~

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