3343. Count Number of Balanced Permutations | Leetcode Daily - Python
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Dive deep into LeetCode's 'Count Number of Balanced Permutations' problem! This video breaks down how to find the number of ways to rearrange a string of digits such that the sum of digits at even positions equals the sum of digits at odd positions. We'll start by understanding the problem with an example, discuss why brute-force is not feasible, and then build up to an efficient dynamic programming solution. Learn how to define the DP state, handle transitions using combinations (N choose K), and why precomputations like factorials and prefix sums are vital. We'll also touch on the crucial initial check for the total sum's parity and the modulo arithmetic required for large results. Finally, we'll analyze the time and space complexity of this clever approach.
Perfect for coding interview preparation and improving problem-solving skills.
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Solution Link:
https://leetcode.com/problems/count-n...
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