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PathSumII.java

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/**

* Definition for binary tree

* public class TreeNode {

* int val;

* TreeNode left;

* TreeNode right;

* TreeNode(int x) { val = x; }

* }

*/

public class Solution {

public List<List<Integer>> result = new ArrayList<List<Integer>>();

public List<List<Integer>> pathSum(TreeNode root, int sum) {

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

this.dfs(curr, root, sum);

return this.result;

}

public void dfs(List<Integer> curr, TreeNode root, int sum) {

if (root == null) {

return;

} else if (root.val == sum && root.left == null && root.right == null) {

curr.add(root.val);

this.result.add(curr);

return;

} else {

List<Integer> copy_left = new ArrayList<Integer>(curr);

copy_left.add(root.val);

List<Integer> copy_right = new ArrayList<Integer>(copy_left);

this.dfs(copy_left, root.left, sum-root.val);

this.dfs(copy_right, root.right, sum-root.val);

}

}

}