LeetCode 40. Combination Sum II(组合求和)
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原题网址:https://leetcode.com/problems/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.
Note:
- All numbers (including target) will be positive integers.
- Elements in a combination (a1, a2, … , ak) must be in non-descending order. (ie, a1 ≤ a2 ≤ … ≤ ak).
- The solution set must not contain duplicate combinations.
For example, given candidate set 10,1,2,7,6,1,5
and target 8
,
A solution set is: [1, 7]
[1, 2, 5]
[2, 6]
[1, 1, 6]
方法:深度优先搜索。
public class Solution { private void find(int[] candidates, int from, int sum, List<Integer> nums, List<List<Integer>> results) { if (sum == 0) { results.add(new ArrayList<>(nums)); return; } if (from >= candidates.length || sum < 0 || candidates[from] > sum) return; for(int i=from; i<candidates.length && candidates[i]<=sum; i++) { if (i>from && candidates[i]==candidates[i-1]) continue; nums.add(candidates[i]); find(candidates, i+1, sum - candidates[i], nums, results); nums.remove(nums.size()-1); } } public List<List<Integer>> combinationSum2(int[] candidates, int target) { List<List<Integer>> results = new ArrayList<>(); if (candidates == null) return results; Arrays.sort(candidates); find(candidates, 0, target, new ArrayList<>(), results); return results; }}
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