2025-08-22 15:38:14 +0000 UTC

Number of Changing Keys
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Code

class Solution:
    def countKeyChanges(self, s: str) -> int:
        res = 0
        for i in range(1, len(s)):
            cur, prev = s[i].lower(), s[i - 1].lower()
            if cur != prev:
                res += 1
        return res