问题描述 问题分析 代码实现 public List<List<Integer>> combinationSum(int[] candidates, int target) { List<Integer> numList = new ArrayList<>(); List<List<Integer>> resultList = new ArrayList(); combinationSum(candidates,target,0,numList,resultList); return resultList; } public void combinationSum(int[] candidates, int target,int index,List<Integer> numList,List<List<Integer>> resultList){ if(target<0){ return; } if(target==0){ resultList.add(new ArrayList<>(numList)); return; } for(int...