Submission #845654


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#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/detail/standard_policies.hpp>
#define F first
#define S second
using namespace std;
using namespace __gnu_pbds;
//using namespace pb_ds;
typedef long long ll;

typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int n;
	cin>>n;
	vector<pair<int, int> > a;
	for (int i=0;i<n;i++){
		int t;
		cin>>t;
		a.push_back({t, i});
	}
	sort(a.begin(), a.end());
	int w=0;
	for (int i=0;i<n;i++){
		if (a[i].S%2 != i%2) w++;
	}
	cout<<w/2<<endl;
}

Submission Info

Submission Time
Task C - BBuBBBlesort!
User Laakeri
Language C++14 (GCC 5.4.1)
Score 600
Code Size 696 Byte
Status AC
Exec Time 38 ms
Memory 1400 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 600 / 600
Status
AC × 2
AC × 24
Set Name Test Cases
Sample s1.txt, s2.txt
All 01.txt, 02.txt, 03.txt, 04.txt, 05.txt, 06.txt, 07.txt, 08.txt, 09.txt, 10.txt, 11.txt, 12.txt, 13.txt, 14.txt, 15.txt, 16.txt, 17.txt, 18.txt, 19.txt, 20.txt, 21.txt, 22.txt, s1.txt, s2.txt
Case Name Status Exec Time Memory
01.txt AC 37 ms 1400 KB
02.txt AC 37 ms 1400 KB
03.txt AC 37 ms 1400 KB
04.txt AC 38 ms 1400 KB
05.txt AC 33 ms 1400 KB
06.txt AC 33 ms 1400 KB
07.txt AC 34 ms 1400 KB
08.txt AC 24 ms 1400 KB
09.txt AC 24 ms 1400 KB
10.txt AC 24 ms 1400 KB
11.txt AC 23 ms 1400 KB
12.txt AC 24 ms 1400 KB
13.txt AC 24 ms 1400 KB
14.txt AC 33 ms 1400 KB
15.txt AC 35 ms 1400 KB
16.txt AC 33 ms 1400 KB
17.txt AC 34 ms 1400 KB
18.txt AC 6 ms 256 KB
19.txt AC 4 ms 256 KB
20.txt AC 5 ms 256 KB
21.txt AC 4 ms 256 KB
22.txt AC 6 ms 256 KB
s1.txt AC 4 ms 256 KB
s2.txt AC 4 ms 256 KB