A COMBINATORICS APPROACH TO The VALID PERMUTATIONS PROBLEM
The Problem This is a solution to this LeetCode problem: https://leetcode.com/problems/valid-permutations-for-di-sequence/description At a basic level, you are given a string containing “I” and “D” representing increases and decreases. The task is to find the number of possible permutations of the numbers from 0 to the size of the string while following the string’s vicissitudes. Input: …
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