#include "shoes.h"
#include <bits/stdc++.h>
using std::cin;
using std::cout;
using std::endl;
using std::vector;
using std::string;
using ll = long long;
using vi = vector<ll>;
using vii = vector<vi>;
using pii = std::pair<ll,ll>;
#define rep(i,j,k) for(ll i=ll(j); i<ll(k); i++)
#define REP(i,j,k) for(ll i=ll(j); i<=ll(k); i++)
#define per(i,j,k) for(ll i=ll(j); i>=ll(k); i--)
#define all(a) a.begin(),a.end()
#define pb emplace_back
#define mp std::make_pair
#define mtp std::make_tuple
constexpr ll inf = (1ll<<60);
struct binary_indexed_tree{
vi node;
ll N;
binary_indexed_tree(int n): N(n){
node.resize(N+1);
}
void add(ll idx, ll val){
idx++;
for(; idx<=N; idx+=(idx&-idx)) node[idx] += val;
}
ll sum(ll idx){
idx++;
ll ret = 0;
for(; 0<idx; idx-=(idx&-idx)) ret += node[idx];
return ret;
}
};
long long count_swaps(std::vector<int> s) {
ll N = s.size();
vii idx(N+1);
rep(i,0,N){
if(s[i] > 0) idx[s[i]].pb(i);
}
REP(i,0,N) reverse(all(idx[i]));
vi p(N);
ll now = 0;
rep(i,0,N){
if(s[i] > 0) continue;
ll val = -s[i];
p[now++] = i;
p[now++] = idx[val].back();
idx[val].pop_back();
}
ll ans = 0;
binary_indexed_tree bit(N);
rep(i,0,N){
ans += i-bit.sum(p[i]);
bit.add(p[i],1);
}
return ans;
}
