Submission #846385


Source Code Expand

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#include <bits/stdc++.h>

using namespace std;

#define REP(i, a, b) for (int i = (a), i##_end_ = (b); i < i##_end_; ++i)
#define debug(...) fprintf(stderr, __VA_ARGS__)
#define mp make_pair
#define x first
#define y second
#define pb push_back
#define SZ(x) (int((x).size()))
#define ALL(x) (x).begin(), (x).end()

template<typename T> inline bool chkmin(T &a, const T &b) { return a > b ? a = b, 1 : 0; }
template<typename T> inline bool chkmax(T &a, const T &b) { return a < b ? a = b, 1 : 0; }

typedef long long LL;

const int oo = 0x3f3f3f3f;

const int maxn = 100000;

int n;
int a[maxn + 5];

map<int, int> pos;

int main()
{
#ifdef matthew99
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
#endif
	scanf("%d", &n);
	REP(i, 0, n) scanf("%d", a + i);
	REP(i, 0, n) pos[a[i]] = i;
	sort(a, a + n);
	int cnt = 0;
	REP(i, 0, n) if ((pos[a[i]] ^ i) & 1) ++cnt;
	printf("%d\n", cnt >> 1);
	return 0;
}

Submission Info

Submission Time
Task C - BBuBBBlesort!
User matthew99
Language C++14 (GCC 5.4.1)
Score 600
Code Size 970 Byte
Status AC
Exec Time 102 ms
Memory 5376 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:34:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
./Main.cpp:35:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  REP(i, 0, n) scanf("%d", a + i);
                                 ^

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 102 ms 5376 KB
02.txt AC 102 ms 5376 KB
03.txt AC 102 ms 5376 KB
04.txt AC 102 ms 5376 KB
05.txt AC 96 ms 5376 KB
06.txt AC 96 ms 5376 KB
07.txt AC 96 ms 5376 KB
08.txt AC 76 ms 5376 KB
09.txt AC 75 ms 5376 KB
10.txt AC 74 ms 5376 KB
11.txt AC 75 ms 5376 KB
12.txt AC 73 ms 5376 KB
13.txt AC 74 ms 5376 KB
14.txt AC 98 ms 5376 KB
15.txt AC 99 ms 5376 KB
16.txt AC 99 ms 5376 KB
17.txt AC 99 ms 5376 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