[刷题]Combination Sum
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[LintCode]Combination Sum
public class Solution { /** * @param candidates: A list of integers * @param target:An integer * @return: A list of lists of integers */ public List<List<Integer>> combinationSum(int[] candidates, int target) { // 2015-08-28 // candicates中不含重复元素,元素可以重复使用 // 解集中不可以含相同解 List<List<Integer>> rst = new ArrayList<List<Integer>>(); if (candidates == null || candidates.length == 0) { return rst; } List<Integer> list = new ArrayList<>(); Arrays.sort(candidates); helper(candidates, rst, list, target, 0); return rst; } private void helper(int[] candidates, List<List<Integer>> rst, List<Integer> list, int left, int pos) { if (left == 0) { rst.add(new ArrayList<Integer>(list)); return; } for (int i = pos; i < candidates.length; i++) { if (left - candidates[i] < 0) { break; } list.add(candidates[i]); helper(candidates, rst, list, left - candidates[i], i); list.remove(list.size() - 1); } }}
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