Buggy python submission (verdict: Runtime Error):
class Tree:
    class Node:
        def __init__(self, n): 
            self.left = None
            self.right = None
            self.n = n 

        def find(self, total):
            if total == 0:
                return True
            elif total < 0:
                return False

            if self.left is None:
                left = (total == self.n)
            else:
                left = self.left.find(total-self.n)

            if self.right is None:
                right = False
            else:
                right = self.right.find(total)
    
            return left or right

        def __str__(self):
            cs = []
            if self.left is not None:
                cs.append(str(self.left))
            if self.right is not None:
                cs.append(str(self.right))

            return "{} -> ({})".format(self.n, ",".join(cs))


    def __init__(self, ns):
        self.top = self.Node(0)
        self.build_node(self.top, sorted(ns))

    def has_subset(self, total):
        return self.top.find(total)

    def build_node(self, node, ns):
        if len(ns) == 0:
            return
    
        node.left = self.Node(ns[-1])
        node.right = self.Node(ns[-1])
        self.build_node(node.left, ns[:-1])
        self.build_node(node.right, ns[:-1])


def run():
    _ = int(input())  # flake8: noqa
    ns = [int(i) for i in input().split()]

    tree = Tree(ns)
    _ = int(input())  # flake8: noqa
    
    for q in (int(j) for j in input().split()):
        if tree.has_subset(q):
            print("yes")
        else:
            print("no")


if __name__ == '__main__':
    run()



Fixed submission:
def create_sums(ns):
    if len(ns) == 0:
        return set()

    s = create_sums(ns[1:])
    return {e + ns[0] for e in s} | s | {ns[0]}


def run_set():
    _ = int(input())  # flake8: noqa
    ns = [int(i) for i in input().split()]

    sums = create_sums(ns)
    _ = int(input())  # flake8: noqa

    for q in (int(j) for j in input().split()):
        if q in sums:
            print("yes")
        else:
            print("no")


if __name__ == '__main__':
    run_set()

Buggy python submission (verdict: Runtime Error):
class Tree:
    class Node:
        def __init__(self, n):
            self.left = None
            self.right = None
            self.n = n

        def find(self, total):
            if total == self.n:
                return True
            elif total < self.n:
                return (self.right is not None
                        and self.right.find(total))
            else:
                return ((self.left is not None
                        and self.left.find(total-self.n))
                        or
                        (self.right is not None
                         and self.right.find(total)))

        def __str__(self):
            cs = []
            if self.left is not None:
                cs.append(str(self.left))
            if self.right is not None:
                cs.append(str(self.right))

            return "{} -> ({})".format(self.n, ",".join(cs))


    def __init__(self, ns):
        self.top = self.build_nodes(sorted(ns))

    def has_subset(self, total):
        return self.top.find(total)

    def build_nodes(self, ns):
        if len(ns) == 0:
            return
        
        node = self.Node(ns[-1])
        node.left = self.build_nodes(ns[:-1])
        node.right = self.build_nodes(ns[:-1])

        return node


def run():
    _ = int(input())  # flake8: noqa
    ns = [int(i) for i in input().split()]

    tree = Tree(ns)
    _ = int(input())  # flake8: noqa
    
    for q in (int(j) for j in input().split()):
        if tree.has_subset(q):
            print("yes")
        else:
            print("no")


if __name__ == '__main__':
    run()



Fixed submission:
def create_sums(ns):
    if len(ns) == 0:
        return set()

    s = create_sums(ns[1:])
    return {e + ns[0] for e in s} | s | {ns[0]}


def run_set():
    _ = int(input())  # flake8: noqa
    ns = [int(i) for i in input().split()]

    sums = create_sums(ns)
    _ = int(input())  # flake8: noqa

    for q in (int(j) for j in input().split()):
        if q in sums:
            print("yes")
        else:
            print("no")


if __name__ == '__main__':
    run_set()