Exercise: Backtracking Problems on LeetCode I

Prerequisites

Before tackling the backtracking algorithm exercises in this chapter, you must be familiar with the thinking methods explained in the following articles:

• Backtracking Algorithm Core Framework
• Backtracking Algorithm to Master Permutations/Combinations/Subsets in Nine Variants
• Ball and Box Model: Two Perspectives of Exhaustive Enumeration in Backtracking Algorithms