How to Solve Separate Black and White Balls Problem
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Separate Black and White Balls
There are n balls on a table, each ball has a color black or white. You are given a 0-indexed binary string s of length n, where 1 and 0 represent black and white balls, respectively. In each step, yo...
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Understanding the Separate Black and White Balls Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
There are n balls on a table, each ball has a color black or white. You are given a 0-indexed binary string s of length n, where 1 and 0 represent black and white balls, respectively. In each step, you can choose two adjacent balls and swap them. Return the minimum number of steps to group all the black balls to the right and all the white balls to the left.
Separate Black and White Balls
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Examples
s = "101"1We can group all the black balls to the right in the following way: - Swap s[0] and s[1], s = "011". Initially, 1s are not grouped together, requiring at least 1 step to group them to the right.
s = "100"2We can group all the black balls to the right in the following way: - Swap s[0] and s[1], s = "010". - Swap s[1] and s[2], s = "001". It can be proven that the minimum number of steps needed is 2.
s = "0111"0All the black balls are already grouped to the right.
Constraints
1 <= n == s.length <= 105s[i] is either '0' or '1'.How Interview Coder Helps with Leetcode Problems
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