#include "shoes.h" #include <bits/stdc++.h> using namespace std; long long count_swaps(vector<int> s) { int n = s.size(); map<int, set<int>> p; long long ans = 0; for (int i = 0; i < n; i++) { if (p.count(-s[i])) { int j = *p[-s[i]].begin(); p[-s[i]].erase(p[-s[i]].begin()); if (p[-s[i]].size() == 0) { p.erase(-s[i]); } ans += i - j - (s[i] > 0); } else { p[s[i]].insert(i); } } return ans; }