1784. Check if Binary String Has at Most One Segment of Ones

Problem Link

Description

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Given a binary string s ​​​​​without leading zeros, return true​​​ if s contains at most one contiguous segment of ones. Otherwise, return false.

 

Example 1:

Input: s = "1001"
Output: false
Explanation: The ones do not form a contiguous segment.

Example 2:

Input: s = "110"
Output: true

 

Constraints:

• 1 <= s.length <= 100
• s[i]​​​​ is either '0' or '1'.
• s[0] is '1'.

Solution

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Python3

class Solution:
    def checkOnesSegment(self, s: str) -> bool:
        return "01" not in s