LeetCode 0040 - Combination Sum II

Parent index: LeetCode 500 Problem Index MOC

Problem Metadata

• LeetCode URL: https://leetcode.com/problems/combination-sum-ii/
• Frontend ID: 40
• Difficulty: Medium
• Primary category: Backtracking
• Source lists: NeetCode Practice, NeetCode 150, NeetCode 250, Sean Prashad LeetCode Patterns

Related Algorithms

• Backtracking
• Backtracking Framework

Research Status

• Problem statement and constraints verified against the LeetCode page.
• Core algorithm explained in paper-style prose.
• Worked examples, edge cases, complexity proof, and pitfalls added.
• Solution variants linked back to the relevant algorithm notes.

See Also

• LeetCode 500 Problem Index MOC
• SWE Interview Preparation MOC