#include "shoes.h" #include <bits/stdc++.h> using namespace std; long long count_swaps(std::vector<int> s) { int cnt = 0; int n = s.size(); vector<int> a = s; for(int i = 0; i < n; i += 2) { if (a[i] != -a[i+1] || a[i] > 0) { swap(a[i], a[i+1]); cnt++; } } return cnt; }