C++ Map Sum Pairs Implementation | LeetCode hard Trie Solution Explained

In this video, we solve the Map Sum Pairs problem (LeetCode 677) using C++. The problem requires designing a map that supports inserting key-value pairs and returning the sum of all values whose keys start with a given prefix.

We implement an efficient Trie-based solution that allows quick insertion and prefix sum queries, making it perfect for coding interviews and competitive programming.

✨ What you’ll learn in this video:

How to implement the MapSum class in C++

Using Trie data structure to efficiently store keys and calculate prefix sums

Step-by-step C++ code explanation with examples

Optimized solution for coding interviews and LeetCode practice

✅ Example Usage:

MapSum mapSum = new MapSum(); mapSum.insert("apple", 3); mapSum.sum("ap"); // returns 3 mapSum.insert("app", 2); mapSum.sum("ap"); // returns 5

This problem is commonly asked in coding interviews, FAANG interviews, and competitive programming contests.
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Видео C++ Map Sum Pairs Implementation | LeetCode hard Trie Solution Explained канала Coding theory