#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
const int N = 400010;
queue <int> q[N];
int res[N];
int dp[N];
struct Segtree{
int tree[4*N];
int join(int a, int b){
return a+b;
}
void build(int node, int l,int r){
if(l == r){
tree[node] = 0;
return;
}
int mid = (l+r)/2;
build(2*node, l, mid);
build(2*node+1, mid+1, r);
tree[node] = 0;
return;
}
void update(int node, int l, int r, int pos){
if(l == r){
tree[node] = 1;
return;
}
int mid = (l+r)/2;
if(l <= pos and pos <= mid) update(2*node, l, mid, pos);
else update(2*node+1, mid+1, r, pos);
tree[node] = join(tree[2*node], tree[2*node+1]);
}
int query(int node, int l, int r, int tl, int tr){
if(l <= tl and tr <= r) return tree[node];
if(l > tr or tl > r) return 0;
int mid = (tl+tr)/2;
return join(query(2*node, l, r, tl, mid), query(2*node+1, l, r, mid+1, tr));
}
} seg;
long long count_swaps(std::vector<int> v) {
int n = v.size();
int num = n;
for(int i = v.size()-1;i >= 0;i--){
if(q[v[i]+n].empty()){
if(v[i] > 0){
res[i+1] = num;
q[n-v[i]].push(num-1);
}
else{
res[i+1] = num-1;
q[n-v[i]].push(num);
}
num -= 2;
}
else{
res[i+1] = q[v[i]+n].front();
q[v[i]+n].pop();
}
}
long long resp = 0;
for(int i = 1;i <= n;i++){
// cout << res[i] << ' ';
resp += seg.query(1, res[i], n, 1, n);
seg.update(1, 1, n, res[i]);
}
return resp;
}
