Ezvor

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

EasyString Preparing judge… LeetCode

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 string has two segments of size 1.

Example 2:

Input: s = "110"
Output: true

 

Constraints:

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

Hints

Hint 1
It's guaranteed to have at least one segment
Hint 2
The string size is small so you can count all segments of ones with no that have no adjacent ones.