counting valleys hackerrank solution in c 2b 2b

1#include <bits/stdc++.h>
2using namespace std;
3
4int main() {
5    int n,updown = 0,res = 0;
6    char c;
7    cin >> n;
8    
9    for(int i = 0; i++ < n;){
10        cin >> c;
11        if(c == 'U')updown++;
12        else updown--;
13        if(updown == 0 && c == 'U')res++;
14    }
15    cout << res << endl;
16    return 0;
17}