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40. Combination Sum II.go
40. Combination Sum II_test.go
README.md

README.md

40. Combination Sum II

题目

Given a collection of candidate numbers (candidates) and a target number (target), find all unique combinations in candidates where the candidate numbers sums to target.

Each number in candidates may only be used once in the combination.

Note:

  • All numbers (including target) will be positive integers.
  • The solution set must not contain duplicate combinations.

Example 1:

Input: candidates = [10,1,2,7,6,1,5], target = 8,
A solution set is:
[
  [1, 7],
  [1, 2, 5],
  [2, 6],
  [1, 1, 6]
]

Example 2:

Input: candidates = [2,5,2,1,2], target = 5,
A solution set is:
[
  [1,2,2],
  [5]
]

题目大意

给定一个数组 candidates 和一个目标数 target ,找出 candidates 中所有可以使数字和为 target 的组合。

candidates 中的每个数字在每个组合中只能使用一次。

解题思路

  • 题目要求出总和为 sum 的所有组合,组合需要去重。这一题是第 39 题的加强版,第 39 题中元素可以重复利用(重复元素可无限次使用),这一题中元素只能有限次数的利用,因为存在重复元素,并且每个元素只能用一次(重复元素只能使用有限次)
  • 这一题和第 47 题类似,只不过元素可以反复使用。
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