C++ Program to Find Longest Subarray with Sum Divisible by K | Prefix Sum + Hash Map | DSA Logic
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YouTubeCoding theory
C++ Program to Find Longest Subarray with Sum Divisible by K | Prefix Sum + Hash Map | DSA Logic
Learn how to find the longest subarray with a sum divisible by k using prefix sum and hashmap in C++. This efficient O(N) approach handles negative numbers and large inputs up to 10^6 size. 🧠 Logic: - Use prefix sum to track total. - Use modulo to find repeating remainders. - Store the first occurrence of each remainder for longest subarray ...
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