Submission #297907

#	Time	Username	Problem	Language	Result	Execution time	Memory
297907		erd1	Arranging Shoes (IOI19_shoes)	C++14	85 / 100	1091 ms	34716 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define pb push_back
#define all(x) (x).begin(), (x).end()
typedef int64_t lld;
typedef pair<int, int> pii;

#include<bits/extc++.h>
using namespace __gnu_pbds;
template<typename T, typename comp = greater<T>>
using OST = tree<T, null_type, comp, rb_tree_tag, tree_order_statistics_node_update>;

template<typename T1, typename T2>
ostream& operator<<(ostream& out, pair<T1, T2> p){
	return out << "(" << p.ff << ", " << p.ss << ")";
}

map<int, int> cnt;
map<pii, int> mp;

OST<int> ost;

long long count_swaps(vector<int> s) {
	lld ans = 0; int id = 0;
	for(auto i: s)if(mp[{-i, cnt[i]}])mp[{i, cnt[i]}] = mp[{-i, cnt[i]}], cnt[i]++; else mp[{i, cnt[i]++}] = ++id;
	cnt.clear(), id = 0;
	for(auto i: s)id = (i > 0?mp[{-i, cnt[i]++}]*2+1:mp[{i, cnt[i]++}]*2), ans += ost.order_of_key(id), ost.insert(id);
	return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 0 / 15