[leetcode]404. Sum of Left Leaves左葉子之和

阿新 • • 發佈：2018-01-29

== clas lean 節點 urn nbsp ftl log tle

弄個flag記錄是不是左節點就行

int res = 0;
    public int sumOfLeftLeaves(TreeNode root) {
        if (root==null) return res;
        leftSum(root,false);
        return res;
    }
    private void leftSum(TreeNode root,boolean flag)
    {
        if (root.left==null&&root.right==null&&flag)
            res 
+=root.val;
        if (root.left!=null)
            leftSum(root.left,true);
        if (root.right!=null)
            leftSum(root.right,false);
    }

== clas lean 節點 urn nbsp ftl log tle 弄個flag記錄是不是左節點就行 int res = 0; public int sumOfLeftLeaves(TreeNode root) { if (root==nul

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[leetcode]404. Sum of Left Leaves左葉子之和

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