Submission #1564543

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Source Code Expand

#include <iostream>
#include <vector>
using namespace std;

int main(){
    int N, ans = 0;
    bool pre = false;
    cin >> N;
    for(int i = 0;i<N;i++){
        int in;
        cin >> in;
        if(in == i + 1){
            if(pre) {
                pre = false;
                continue;
            }
            ans++;
            pre = true;
            continue;
        }
        if(pre) pre = false;
    }
    cout << ans << endl;
    return 0;

}

Submission Info

Judge Result