Leetcode - Split a String in Balanced Strings Solution
1 min read

Leetcode - Split a String in Balanced Strings Solution

Balanced strings are those that have an equal quantity of 'L' and 'R' characters.

Given a balanced string s, split it in the maximum amount of balanced strings.

Return the maximum amount of split balanced strings.

Example 1:

Input: s = "RLRRLLRLRL"
Output: 4
Explanation: s can be split into "RL", "RRLL", "RL", "RL", each substring contains same number of 'L' and 'R'.

Example 2:

Input: s = "RLLLLRRRLR"
Output: 3
Explanation: s can be split into "RL", "LLLRRR", "LR", each substring contains same number of 'L' and 'R'.

Example 3:

Input: s = "LLLLRRRR"
Output: 1
Explanation: s can be split into "LLLLRRRR".

Example 4:

Input: s = "RLRRRLLRLL"
Output: 2
Explanation: s can be split into "RL", "RRRLLRLL", since each substring contains an equal number of 'L' and 'R'

Constraints:

  • 1 <= s.length <= 1000
  • s[i] is either 'L' or 'R'.
  • s is a balanced string.

Solution in Python

class Solution:
    def balancedStringSplit(self, s: str) -> int:
        balance = 0
        count = 0
        for i in s:
            if i == "R":
                balance -=1
            else:
                balance +=1
            if balance == 0:
                count+=1
        return count

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