Submission #848240


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#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
typedef pair<int,int> PII;
int main() {
	
	int N;
	cin >> N;
	vector<int> A;
	vector<int> B;
	vector<int> all;
	for(int i=0; i<N; i++) {
		int a;
		cin >> a;
		if(i%2==0) A.push_back(a);
		else B.push_back(a);
		all.push_back(a);
	}
	vector<int> original = all;
	sort(all.begin(), all.end());
	int sum = 0;
	for(int i=0; i<N; i++) {
		int p = upper_bound(all.begin(), all.end(), original[i]) - all.begin();
		if((abs(p-i))%2 == 0)
			sum++;
	}
	cout << sum / 2 << endl;
	return 0;
}

Submission Info

Submission Time
Task C - BBuBBBlesort!
User tokoharu
Language C++14 (GCC 5.4.1)
Score 600
Code Size 581 Byte
Status AC
Exec Time 108 ms
Memory 1652 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 107 ms 1652 KB
02.txt AC 107 ms 1652 KB
03.txt AC 108 ms 1652 KB
04.txt AC 107 ms 1652 KB
05.txt AC 87 ms 1652 KB
06.txt AC 87 ms 1652 KB
07.txt AC 87 ms 1652 KB
08.txt AC 70 ms 1652 KB
09.txt AC 70 ms 1652 KB
10.txt AC 68 ms 1652 KB
11.txt AC 68 ms 1652 KB
12.txt AC 69 ms 1652 KB
13.txt AC 70 ms 1652 KB
14.txt AC 87 ms 1652 KB
15.txt AC 90 ms 1652 KB
16.txt AC 87 ms 1652 KB
17.txt AC 88 ms 1652 KB
18.txt AC 4 ms 256 KB
19.txt AC 4 ms 256 KB
20.txt AC 4 ms 256 KB
21.txt AC 4 ms 256 KB
22.txt AC 4 ms 256 KB
s1.txt AC 4 ms 256 KB
s2.txt AC 6 ms 256 KB