Submission #1559166


Source Code Expand

#include <bits/stdc++.h>

using namespace std;

//#define _FILES
const int maxn = 100005;
int a[maxn];

int main()
{
    ios_base::sync_with_stdio(false);

    #ifdef _FILES
        freopen("","r",stdin);
        freopen("","w",stdout);
    #endif // _FILES
    int n;
    cin >> n;
    for (int i=1;i<=n;i++)
    {
        int x;
        cin >> x;
        if (x == i) a[i] = 1;
    }
    int ans = 0;
    int counter = 0;

    for (int i=1;i<=n;i++)
    {
        if (!a[i])
        {
            ans += counter/2 + (counter & 1);
            counter = 0;
        }
        else
        {
            counter++;
        }
    }
    ans += counter/2 + (counter & 1);
    cout << ans << endl;
    return 0;
}

Submission Info

Submission Time
Task D - Derangement
User AL2K
Language C++14 (GCC 5.4.1)
Score 400
Code Size 753 Byte
Status AC
Exec Time 10 ms
Memory 640 KB

Judge Result

Set Name Sample All
Score / Max Score 0 / 0 400 / 400
Status
AC × 4
AC × 15
Set Name Test Cases
Sample 0_000.txt, 0_001.txt, 0_002.txt, 0_003.txt
All 0_000.txt, 0_001.txt, 0_002.txt, 0_003.txt, 1_004.txt, 1_005.txt, 1_006.txt, 1_007.txt, 1_008.txt, 1_009.txt, 1_010.txt, 1_011.txt, 1_012.txt, 1_013.txt, 1_014.txt
Case Name Status Exec Time Memory
0_000.txt AC 1 ms 256 KB
0_001.txt AC 1 ms 256 KB
0_002.txt AC 1 ms 256 KB
0_003.txt AC 1 ms 256 KB
1_004.txt AC 1 ms 256 KB
1_005.txt AC 9 ms 640 KB
1_006.txt AC 9 ms 640 KB
1_007.txt AC 9 ms 256 KB
1_008.txt AC 9 ms 640 KB
1_009.txt AC 9 ms 640 KB
1_010.txt AC 9 ms 256 KB
1_011.txt AC 9 ms 640 KB
1_012.txt AC 9 ms 640 KB
1_013.txt AC 10 ms 640 KB
1_014.txt AC 9 ms 256 KB