Map Sum Pairs
Explore how to implement a Map Sum Pair data structure that supports inserting key-value pairs and calculating prefix sums. Understand the use of tries to efficiently update values and compute sums for keys sharing common prefixes.
We'll cover the following...
We'll cover the following...
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): ...