典型的DFS吧 这一类还有permutation啊,求组合啊,之类的~~~
代码:
public class Solution { private ArrayList<ArrayList<Integer>> result = new ArrayList<ArrayList<Integer>>(); public ArrayList<ArrayList<Integer>> combinationSum(int[] candidates, int target) { // Start typing your Java solution below // DO NOT write main() function if(candidates == null||candidates.length == 0) return null; int len = candidates.length; Arrays.sort(candidates); result.clear(); ArrayList<Integer> list = new ArrayList<Integer>(); dfs(candidates,target,list,0); return result; } public void dfs(int[]a,int key, ArrayList<Integer> list,int i){ if(key == 0){//找到解 ArrayList<Integer> temp = new ArrayList<Integer>(); temp.addAll(list); result.add(temp); return; } if(i == a.length) return; dfs(a,key,list,i+1);//不选择a[i]; int count = 1; while(a[i]*count <= key){//重复选择a[i] for(int j = 1;j<=count;j++) list.add(a[i]); dfs(a,key-a[i]*count,list,i+1); for(int j = 1;j<=count;j++) list.remove(list.size()-1); count++; } } }
Combination Sum II
//待补充~
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