#include<iostream>
#include<string>

using namespace std;
class Solution {
public:
    bool checkOnesSegment(string s) {
     //   int count1 = 0;
       // int count2 = 0;
       bool falg = false;
        int index = 0;
        while(index<s.size())
        {
            if(s[index] == '0')
            {
                falg = true;
            }
            if(falg&&s[index] == '1')
            return false;
            index++;
        }
        return true;
    }
};

int main()
{
    return 0;
}