My java recursive solution

  • 0

    To find the left leaves. Use recursive function to traversal all of the nodes, and find and sum the left leaf

    public int sumOfLeftLeaves(TreeNode root) {
        if (root == null) {
            return 0;
        int sum = 0;
        // Check the left node is a leaf or not. If yes, add it to sum and return the sum
        if (root.left != null && root.left.left == null && root.left.right == null) {
            sum += root.left.val;
        sum += sumOfLeftLeaves(root.left);
        sum += sumOfLeftLeaves(root.right);
        return sum;

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