Submission #1628161

---

Source Code Expand

#include <bits/stdc++.h>
using namespace std;

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);

    int N;
    cin >> N;

    vector<int> vi;
    int ans = 0;
    for (int i = 0; i < N; i++)
    {
        int p;
        cin >> p;
        vi.push_back(p);

        if (i >= 1)
        {
            if (vi[i - 1] == i)
            {
                swap(vi[i - 1], vi[i]);
                ans++;
            }
        }
    }
    if (vi[N-1] == N) ans++;
    cout << ans << endl;

    return 0;
}

Submission Info

Judge Result