@turbocv Interesting thinking. What makes you think of D&C?
@dachuan.huang the tag of this problem is Divided and Conquer.
@Joyce_Lee it's easy to use '+' or '-' to merge two sub-expressions, but not that easy to merge with '*' or '/'.
I've shared one here: https://discuss.leetcode.com/topic/88600/c-divide-and-conquer-solution-69-ms
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