How to Solve Kth Smallest Instructions Problem
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Kth Smallest Instructions
Bob is standing at cell (0, 0), and he wants to reach destination: (row, column). He can only travel right and down. You are going to help Bob by providing instructions for him to reach destination. T...
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Understanding the Kth Smallest Instructions Problem
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Problem Statement
Bob is standing at cell (0, 0), and he wants to reach destination: (row, column). He can only travel right and down. You are going to help Bob by providing instructions for him to reach destination. The instructions are represented as a string, where each character is either: 'H', meaning move horizontally (go right), or 'V', meaning move vertically (go down). Multiple instructions will lead Bob to destination. For example, if destination is (2, 3), both "HHHVV" and "HVHVH" are valid instructions. However, Bob is very picky. Bob has a lucky number k, and he wants the kth lexicographically smallest instructions that will lead him to destination. k is 1-indexed. Given an integer array destination and an integer k, return the kth lexicographically smallest instructions that will take Bob to destination.
Kth Smallest Instructions
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Examples
destination = [2,3], k = 1"HHHVV"All the instructions that reach (2, 3) in lexicographic order are as follows: ["HHHVV", "HHVHV", "HHVVH", "HVHHV", "HVHVH", "HVVHH", "VHHHV", "VHHVH", "VHVHH", "VVHHH"].
destination = [2,3], k = 2"HHVHV"destination = [2,3], k = 3"HHVVH"Constraints
destination.length == 21 <= row, column <= 151 <= k <= nCr(row + column, row), where nCr(a, b) denotes a choose b.How Interview Coder Helps with Leetcode Problems
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