Map Sum Pairs
Explore how to implement a MapSum data structure that inserts key-value pairs and returns the sum of values for keys sharing a prefix. Understand using trie patterns to handle prefix queries efficiently and update values dynamically, enhancing your problem-solving skills for coding interviews.
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Statement
Design a data structure that supports the following operations:
Insert a key-value pair:
Each key is a string, and each value is an integer.
If the key already exists, update its value to (overriding the previous value).
Return the prefix sum:
Given a string,
prefix, return the total sum of all values associated with keys that start with this prefix.
To accomplish this, implement a class MapSum:
Constructor: Initializes the object.
void insert (String key, int val): ...