<doocs>2265.Count Nodes Equal to Average of Subtree_1.py
def dfs(root):
    if root is None:
        return 0, 0
    ls, ln = dfs(root.left)
    rs, rn = dfs(root.right)
    s = ls + rs + root.val
    n = ln + rn + 1
    if s // n == root.val:
        nonlocal ans
        ans += 1
    return s, n
def sample_funcname ( var_1 ) :
    if var_1 is None :
        return 0 , 0
    var_4 , var_6 = var_0 ( var_1.left )
    var_7 , var_9 = var_0 ( var_1.right )
    var_11 = var_4 + var_7 + var_1.val
    var_13 = var_6 + var_9 + 1
    if var_11 // var_13 == var_1.val :
        nonlocal var_14
        var_14 += 1
    return var_11 , var_13
