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Grokking the Coding Interview Patterns

Solution: Contiguous Array

Understand how to apply hash maps and running prefix counts to find the maximum length of contiguous subarrays with equal numbers of 0s and 1s. Explore the logic behind representing 0s as -1 and using prefix sums to detect balanced subarrays efficiently.

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Statement

You are given a binary array nums containing only 0s0s and 1s1s. Your task is to find the maximum length of a contiguous subarray in which the number of 0s0s and 1s1s is exactly equal.

Return the length of the longest such subarray.

Constraints:

  • 1≤1 \leq nums.length ≤105\leq 10^5

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