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public class PathSumII {
public List<List<Integer>> pathSum(TreeNode root, int sum) {
List<List<Integer>> result = new ArrayList<List<Integer>>();
if (root == null) {
return result;
}
List<Integer> crt = new ArrayList<Integer>();
helper(root, crt, result, sum);
return result;
}
private void helper(TreeNode root, List<Integer> crt, List<List<Integer>> result, int target) {
if (root == null) {
return;
}
crt.add(root.val);
if (root.left == null && root.right == null) {
if (root.val == target) {
List<Integer> tmp = new ArrayList<Integer>(crt);
result.add(tmp);
}
} else {
if (root.left != null) {
helper(root.left, new ArrayList<Integer>(crt), result, target - root.val);
}
if (root.right != null) {
helper(root.right, crt, result, target - root.val);
}
}
}
}
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