Submission #845287


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#include <sstream>
#include <vector>
#include <algorithm>
#include <cstring>
#include <cstdlib>
#include <iostream>
#include <string>
#include <cassert>
#include <ctime>
#include <map>
#include <math.h>
#include <cstdio>
#include <set>
#include <deque>
#include <memory.h>
#include <queue>

#pragma comment(linker, "/STACK:64000000")
typedef long long ll;

using namespace std;

const int MAXN = 1 << 18;
const int MOD = 1; // 1000 * 1000 * 1000 + 7;
const int INF = 2e9;
const double PI = acos(-1.0);

int main() {
#ifdef _MSC_VER
	freopen("input.txt", "r", stdin);
#endif

	int n;
	while (cin >> n) {
		vector<int> a(n);
		for (int i = 0; i < n; i++) {
			cin >> a[i];
		}
		vector<int> b = a;
		sort(b.begin(), b.end());
		for (int i = 0; i < n; i++) {
			a[i] = lower_bound(b.begin(), b.end(), a[i]) - b.begin();
		}
		int c = 0;
		for (int i = 0; i < n; i++) {
			if (a[i] % 2 != i % 2) c++;
		}
		assert(c % 2 == 0);
		cout << c / 2 << endl;
	}

	return 0;
}

Submission Info

Submission Time
Task C - BBuBBBlesort!
User izban
Language C++14 (GCC 5.4.1)
Score 600
Code Size 1016 Byte
Status AC
Exec Time 105 ms
Memory 1024 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 103 ms 1024 KB
02.txt AC 103 ms 1024 KB
03.txt AC 103 ms 1024 KB
04.txt AC 105 ms 1024 KB
05.txt AC 83 ms 1024 KB
06.txt AC 83 ms 1024 KB
07.txt AC 83 ms 1024 KB
08.txt AC 66 ms 1024 KB
09.txt AC 66 ms 1024 KB
10.txt AC 64 ms 1024 KB
11.txt AC 64 ms 1024 KB
12.txt AC 65 ms 1024 KB
13.txt AC 66 ms 1024 KB
14.txt AC 83 ms 1024 KB
15.txt AC 83 ms 1024 KB
16.txt AC 83 ms 1024 KB
17.txt AC 83 ms 1024 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 4 ms 256 KB