NeetCode #511LC-1718MediumBacktracking
← Back to All Problems#511 · #1718 · Construct the Lexicographically Largest Valid Sequence(构建字典序最大的可行序列)
📌 Problem Statement & Constraints
Given an integer
n, construct the lexicographically largest sequence of length 2n - 1 containing two occurrences of each number from 1 to n, and one occurrence of 1, such that the two occurrences of x (for x > 1) are exactly x positions apart. Constraints: 1 <= n <= 20.🔒
Sign In to Unlock Full Solutions for All 973 Problems
Sign in to access step-by-step logic, benchmark Python3 code, complexity breakdown, and offline export!