Submission #808834

#	Time	Username	Problem	Language	Result	Execution time	Memory
808834		OrazB	Arranging Shoes (IOI19_shoes)	C++14	100 / 100	290 ms	275864 KiB

shoes

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define all(x) (x).begin(), (x).end()
#define ll long long int
#define pii pair <int, int>
#define pb push_back
#define ff first
#define ss second

const int N = 2e5+5;
deque<int> lft[N], rgt[N];

ll count_swaps(vector<int> S){
	int n = S.size();
	S.insert(S.begin(), -1);
	for (int i = 1; i <= n; i++){
		if (S[i] > 0) rgt[S[i]].pb(i);
		else lft[-S[i]].pb(i);	
	}
	ll ans = 0;
	ordered_set s;
	for (int i = 1; i <= n; i++){
		if (s.find(i) != s.end()) continue;
		int j = 0;
		while(s.size() and (*s.begin()) <= i) s.erase(s.begin());
		if (S[i] > 0) j = lft[S[i]].front();
		else j = rgt[-S[i]].front();
		lft[abs(S[i])].pop_front();
		rgt[abs(S[i])].pop_front();
		ans += (j-i-s.order_of_key(j)-(S[i] < 0));
		s.insert(j);
	}
	return ans;
}

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