The grouping insight is the key one — once you reframe it as counting consecutive block lengths rather than tracking individual characters, the O(n) solution becomes natural. The common mistake is reaching for a stack or hashmap when the constraint (equal 0s and 1s) already implies a linear scan is sufficient. Recognizing that pattern is a transferable skill across a lot of string problems.
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The grouping insight is the key one — once you reframe it as counting consecutive block lengths rather than tracking individual characters, the O(n) solution becomes natural. The common mistake is reaching for a stack or hashmap when the constraint (equal 0s and 1s) already implies a linear scan is sufficient. Recognizing that pattern is a transferable skill across a lot of string problems.