이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
#include <bits/extc++.h>
template <class T, class Comp = less<T>>
using ordered_set = __gnu_pbds::tree<
T, __gnu_pbds::null_type, Comp,
__gnu_pbds::rb_tree_tag,
__gnu_pbds::tree_order_statistics_node_update
>;
long long count_swaps(vector<int> s) {
int n = s.size() / 2;
map<int, vector<int>> nxt;
ordered_set<int> shoes;
for (int i = 2 * n - 1; i >= 0; --i) {
nxt[s[i]].push_back(i);
shoes.insert(i);
}
long long ans = 0;
while (!shoes.empty()) {
auto i = *shoes.begin();
shoes.erase(shoes.begin());
int x = s[i];
nxt[x].pop_back();
int j = nxt[-x].back();
nxt[-x].pop_back();
ans += shoes.order_of_key(j) + (x > 0);
shoes.erase(j);
}
return ans;
}
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