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记录反向思考的题目。比如: 991. 坏了的计算器
class Solution:
    def brokenCalc(self, startValue: int, target: int) -> int:
        ans = 0
        while startValue != target:
            if target < startValue: return ans + startValue - target
            if target & 1:
                target += 1
            else:
                target = target // 2
            ans += 1
        return ansMetadata
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