Submission #845498


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/**
 *    author:  [itmo] enot.1.10
 *    created: 21.08.2016 15:12:43       
**/
#define __USE_MINGW_ANSI_STDIO 0
#include <bits/stdc++.h>

#define F first
#define S second
#define pb push_back
#define mp make_pair
#define forn(i, n) for(int i = 0 ; (i) < (n) ; ++i)
#define eprintf(...) fprintf(stderr, __VA_ARGS__),fflush(stderr)
#define sz(a) ((int)(a).size())
#define all(a) (a).begin(),a.end()
#define pw(x) (1LL<<(x))

using namespace std;

typedef long long ll;
typedef double dbl;
typedef vector<int> vi;
typedef pair<int, int> pi;

const int inf = 1.01e9;
const dbl eps = 1e-9;

/* --- main part --- */

const int N = 1e5 + 10;

pi a[N];

int main()
{
    #ifdef home
        assert(freopen("1.in", "r", stdin));
        assert(freopen("1.out", "w", stdout));
    #endif
    int n;
    scanf("%d", &n);
    forn(i, n) scanf("%d", &a[i].F);
    forn(i, n) a[i].S = i;
    sort(a, a + n);
    int res = 0;
    forn(i, n) if (i % 2 != a[i].S % 2) res++;
    res /= 2;
    printf("%d\n", res);
    #ifdef home
        eprintf("time = %d ms\n", (int)(clock() * 1000. / CLOCKS_PER_SEC));
    #endif
    return 0;
}

Submission Info

Submission Time
Task C - BBuBBBlesort!
User enot
Language C++14 (GCC 5.4.1)
Score 600
Code Size 1172 Byte
Status AC
Exec Time 38 ms
Memory 1024 KB

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:41:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
                    ^
./Main.cpp:42:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     forn(i, n) scanf("%d", &a[i].F);
                                    ^

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 1024 KB
02.txt AC 37 ms 1024 KB
03.txt AC 37 ms 1024 KB
04.txt AC 38 ms 1024 KB
05.txt AC 33 ms 1024 KB
06.txt AC 33 ms 1024 KB
07.txt AC 33 ms 1024 KB
08.txt AC 24 ms 1024 KB
09.txt AC 24 ms 1024 KB
10.txt AC 23 ms 1024 KB
11.txt AC 24 ms 1024 KB
12.txt AC 24 ms 1024 KB
13.txt AC 24 ms 1024 KB
14.txt AC 33 ms 1024 KB
15.txt AC 34 ms 1024 KB
16.txt AC 33 ms 1024 KB
17.txt AC 33 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