LeetCode 1422. Maximum Score After Splitting a String

Description

https://leetcode.com/problems/maximum-score-after-splitting-a-string/

Given a string s of zeros and ones, return the maximum score after splitting the string into two non-empty substrings (i.e. left substring and right substring).

The score after splitting a string is the number of zeros in the left substring plus the number of ones in the right substring.

Example 1:

Input: s = "011101"
Output: 5 
Explanation: 
All possible ways of splitting s into two non-empty substrings are:
left = "0" and right = "11101", score = 1 + 4 = 5 
left = "01" and right = "1101", score = 1 + 3 = 4 
left = "011" and right = "101", score = 1 + 2 = 3 
left = "0111" and right = "01", score = 1 + 1 = 2 
left = "01110" and right = "1", score = 2 + 1 = 3

Example 2:

Input: s = "00111"
Output: 5
Explanation: When left = "00" and right = "111", we get the maximum score = 2 + 3 = 5

Example 3:

Input: s = "1111"
Output: 3

Constraints:

  • 2 <= s.length <= 500
  • The string s consists of characters ‘0’ and ‘1’ only.

Explanation

Split the string and count how many ‘0’ s in the left side and how many ‘1’s in the right side.

Python Solution

class Solution:
    def maxScore(self, s: str) -> int:
        split = 1
        
        max_score = 0
        while split < len(s):
            
            left = s[:split]
            right = s[split:]
            
            score = left.count('0') + right.count('1')
            max_score = max(max_score, score)
            
            split += 1
            
        return max_score
    
  • Time Complexity: O(N).
  • Space Complexity: O(1).

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