Submission #583289

#	Time	Username	Problem	Language	Result	Execution time	Memory
583289		Lucpp	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1 ms	300 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define sz(x) ((int)(x).size())

vector<int> fen;
void add(int i, int x){
	for(i++; i < sz(fen); i+=i&-i) fen[i] += x;
}
int qry(int i){
	int ans = 0;
	for(i++; i > 0; i-=i&-i) ans += fen[i];
	return ans;
}

ll count_swaps(vector<int> s) {
	fen.resize(sz(s)+1);
	vector<queue<int>> v(sz(s)/2+1);
	for(int i = 0; i < sz(s); i++){
		if(s[i] > 0) v[s[i]].push(i);
	}
	ll ans = 0;
	for(int i = 0; i < sz(s); i++){
		if(s[i] > 0) continue;
		int L = i+qry(i);
		int R = v[-s[i]].front(); v[-s[i]].pop();
		R += qry(R);
		ans += abs(R-L)-(R>L);
		add(R, 1);
		add(L, -1);
	}
	return ans;
}

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