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38 lines (31 loc) · 920 Bytes
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package leetcode.medium;
import java.util.ArrayList;
import java.util.List;
import utils.DataStructures.TreeNode;
public class P_113 {
static List<List<Integer>> res;
static int sum;
public List<List<Integer>> pathSum(TreeNode root, int targetSum) {
res = new ArrayList<>();
sum = targetSum;
dfs(root, new ArrayList<>());
return res;
}
private static void dfs(TreeNode node, List<Integer> curr) {
if (node == null) {
return;
}
curr.add(node.val);
sum -= node.val;
dfs(node.left, curr);
fLeaf(node, curr);
dfs(node.right, curr);
curr.remove(curr.size() - 1);
sum += node.val;
}
private static void fLeaf(TreeNode node, List<Integer> curr) {
if (node.left == null && node.right == null && sum == 0) {
res.add(new ArrayList<>(curr));
}
}
}