FilesExpand file tree

 main

/

0039-combination-sum.java

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

29 lines (26 loc) · 865 Bytes

 main

/

0039-combination-sum.java

Copy path

Top

File metadata and controls

• Code
• Blame

29 lines (26 loc) · 865 Bytes

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

class Solution {

public List<List<Integer>> combinationSum(int[] candidates, int target) {

List<List<Integer>> ans = new ArrayList<List<Integer>>();

List<Integer> cur = new ArrayList();

backtrack(candidates, target, ans, cur, 0);

return ans;

}

public void backtrack(

int[] candidates,

int target,

List<List<Integer>> ans,

List<Integer> cur,

int index

) {

if (target == 0) {

ans.add(new ArrayList(cur));

} else if (target < 0 || index >= candidates.length) {

return;

} else {

cur.add(candidates[index]);

backtrack(candidates, target - candidates[index], ans, cur, index);

cur.remove(cur.get(cur.size() - 1));

backtrack(candidates, target, ans, cur, index + 1);

}

}

}