#include "shoes.h" #include<bits/stdc++.h> #define INF 1e9+7 #define ll long long #define ull unsigned ll #define pii pair<int,int> #define pll pair<ll,ll> #define pcc pair<char,char> #define pdd pair<long double,long double> #define pipii pair<int,pii> #define plpll pair<ll,pll> #define vi vector<int> #define vvi vector<vi> #define v3i vector<vvi> #define v4i vector<v3i> #define fi first #define se second #define mp make_pair #define eb emplace_back #define ins insert #define ln '\n' #define all(v) v.begin(),v.end() using namespace std; ll count_swaps(vi s) { return !(s[0]<0); }