#include "shoes.h" #include <bits/stdc++.h> // solved by bekagg #define ll long long #define ent '\n' #define pb push_back #define all(x) x.begin(),x.end() #define PRaim_bek_abi ios_base::sync_with_stdio(0);cin.tie(0); using namespace std; const int N = 4e5+5; const int MOD = 1e9+7; int t[4 * N] , ans; bool us[N]; set<int>p[N][2]; void build(int v , int tl , int tr){ t[v] = tr - tl + 1; if (tl == tr) return; int tm = (tl + tr) / 2; build(v * 2 , tl , tm) , build(v * 2 + 1 , tm + 1 , tr); } void update(int v , int tl , int tr , int i , int x){ if (tl == tr){ t[v] = x; return; } int tm = (tl + tr) / 2; if (i <= tm) update(v * 2 , tl , tm , i , x); else update(v * 2 + 1 , tm + 1 , tr , i , x); t[v] = t[v * 2] + t[v * 2 + 1]; } int get(int v , int tl , int tr , int l , int r){ if (tr < l or r < tl) return 0; if (l <= tl and tr <= r) return t[v]; int tm = (tl + tr) / 2; return get(v * 2 , tl , tm , l , r) + get(v * 2 + 1 , tm + 1 , tr , l , r); } int count_swaps(vector<int> a){ build(1 , 1 , a.size()); for (int i = 1; i <= a.size(); i++){ p[abs(a[i - 1])][(a[i - 1] > 0)].insert(i); } for (int i = 1; i <= a.size(); i++){ if (us[i]) continue; update(1 , 1 , n , i , 0); auto it = p[abs(a[i - 1])][(a[i - 1] < 0)].upper_bound(i); update(1 , 1 , n , *it , 0); ans += get(1 , 1 , n , i , *it); us[*it] = 1; p[abs(a[i - 1])][(a[i - 1] < 0)].erase(it); } return ans; }

shoes.cpp:45:5: error: ambiguating new declaration of 'int count_swaps(std::vector<int>)'
   45 | int count_swaps(vector<int> a){
      |     ^~~~~~~~~~~
In file included from shoes.cpp:1:
shoes.h:7:11: note: old declaration 'long long int count_swaps(std::vector<int>)'
    7 | long long count_swaps(std::vector<int> S);
      |           ^~~~~~~~~~~
shoes.cpp: In function 'int count_swaps(std::vector<int>)':
shoes.cpp:56:24: error: 'n' was not declared in this scope
   56 |         update(1 , 1 , n , i , 0);
      |                        ^