Binary Numbers Solution in CPP

This Page Contains the Solution in Cpp Programming Language for the Day 10 : Binary Numbers, Code Challange of the HackerRank 30 Days of Code.

#include <bits/stdc++.h>

using namespace std;

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

int main()
{
    string n_temp;
    getline(cin, n_temp);

    int n = stoi(ltrim(rtrim(n_temp)));
    int sum=0;
    int max=0;
    while(n>0)
    {
        if(n%2==1)
        {
            sum++;
            if(sum>max)
            {
                max=sum;
            }
        }
        else
        {
            sum=0;
        }
        n/=2;
    }
    cout<<max;
    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;
}