oj.uz

Submission #961756

# Submission time Handle Problem Language Result Execution time Memory
961756 2024-04-12T12:09:08 Z raspy Arranging Shoes (IOI19_shoes) C++14
10 / 100
 79 ms 135744 KB 
#include "shoes.h"
#include <queue>
#include <iostream>

#define mx 100000

using namespace std;

queue<int> ns[200005];
int fn[200005];

long long qr(int n, int x)
{
	int rez = 0;
	for (int i = x+1; i; i-=(i&-i))
		rez += fn[i];
	return rez;
}

void upd(int n, int x)
{
	for (int i = x+1; i <= n; i+=(i&-i))
		fn[x]++;
}

long long count_swaps(vector<int> s)
{
	int n = s.size();
	for (int i = 0; i < n; i++)
		ns[s[i]+mx].push(i);
	int rez = 0;
	for (int i = 0; i < n; i++)
	{
		if (ns[s[i]+mx].empty() || ns[s[i]+mx].front() != i)
			continue;
		ns[s[i]+mx].pop();
		int par = s[i]*-1+mx;
		rez += ns[par].front()-i-qr(n, i)+qr(n, ns[par].front())-1;
		// cout << i << ": " << ns[par].front()-i-qr(n, i)+qr(n, ns[par].front())-1 << "\n";
		ns[par].pop();
		if (s[i] > 0 && (i+qr(n, i))%2 == 0)
			rez++;
		if (s[i] < 0 && (i+qr(n, i))%2 == 1)
			rez++;
		upd(n, ns[par].front());
	}
	return rez;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 135504 KB Output is correct
2 Correct 63 ms 135572 KB Output is correct

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 135504 KB Output is correct
2 Correct 63 ms 135572 KB Output is correct
3 Incorrect 79 ms 135504 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 135504 KB Output is correct
2 Correct 63 ms 135572 KB Output is correct
3 Incorrect 64 ms 135508 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 69 ms 135744 KB Output is correct
2 Incorrect 62 ms 135508 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 135504 KB Output is correct
2 Correct 63 ms 135572 KB Output is correct
3 Incorrect 79 ms 135504 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 68 ms 135504 KB Output is correct
2 Correct 63 ms 135572 KB Output is correct
3 Incorrect 79 ms 135504 KB Output isn't correct
4 Halted 0 ms 0 KB -