Alik Elzin. Code is below. Faster than 100%, very easy to understand backtracking. Note: All numbers (including target) will be positive integers. Every time that you see -sum ("minus" sum) in the hash table, increment the solution At the end the complexity becomes 2*500*500 (500k) at the cost of 250k space. Note: All numbers (including target) will be positive integers. 2020-02-03. Median of Two Sorted Arrays 5. Note: All numbers (including target) will be positive integers. Combination sum II: Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each number in C may only be used once in the combination. Java solution using dfs, easy understand. Solution: https://github.com/jzysheep/LeetCode/blob/master/39.%20Combination%20Sum%20Solution1.cpp By zxi on October 16, 2017. 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