Leetcode Problem 677. Map Sum Pairs

677. Map Sum Pairs

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Initialize two hashmaps: one for storing key-value pairs (keyMap) and another for prefix sums (prefixMap).
For the insert method: a. Calculate the value difference (delta) if the key already exists. b. Update the value in keyMap. c. Update the sums in prefixMap for each prefix of the key by adding delta.
For the sum method: a. Return the sum associated with the prefix in prefixMap, or 0 if the prefix does not exist.

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