Counting Valleys.cpp

#include <bits/stdc++.h>

using namespace std;

string ltrim(const string &);
string rtrim(const string &);

/*
 * Complete the 'countingValleys' function below.
 *
 * The function is expected to return an INTEGER.
 * The function accepts following parameters:
 *  1. INTEGER steps
 *  2. STRING path
 */

int countingValleys(int steps, string path) {
    int lvl=0;
    int out=0;
    for(char c: path){
        if(c=='U'){
            if(lvl==-1) out++;
            lvl++;
        }else lvl--;
    }
    return out;
}

int main()
{
    ofstream fout(getenv("OUTPUT_PATH"));

    string steps_temp;
    getline(cin, steps_temp);

    int steps = stoi(ltrim(rtrim(steps_temp)));

    string path;
    getline(cin, path);

    int result = countingValleys(steps, path);

    fout << result << "\n";

    fout.close();

    return 0;
}

string ltrim(const string &str) {
    string s(str);

    s.erase(
        s.begin(),
        find_if(s.begin(), s.end(), not1(ptr_fun<int, int>(isspace)))
    );

    return s;
}

string rtrim(const string &str) {
    string s(str);

    s.erase(
        find_if(s.rbegin(), s.rend(), not1(ptr_fun<int, int>(isspace))).base(),
        s.end()
    );

    return s;
}