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中级

实现账户状态流转合法性验证

未完成
中级参考 代码结构已给出，请填写 ____ 处 
def solve():
    from pyodide.http import open_url
    offices_csv = open_url(____).read()
    staff_csv = open_url(____).read()
    savings_products_csv = open_url(____).read()
    clients_csv = open_url(____).read()
    savings_accounts_csv = open_url(____).read()
    savings_account_transactions_csv = open_url(____).read()
    gl_accounts_csv = open_url(____).read()
    charges_csv = open_url(____).read()
    savings_account_charges_csv = open_url(____).read()
    VALID_TRANSITIONS = {
        '____': ['____'],
        '____': ['____','____','____'],
        '____': ['____'],
        '____': ['____','____'],
        '____': [],
    }
    def validate_transition(____):
        return '____' if tgt in VALID_TRANSITIONS.get(____) else '____'
    for cur, tgt in [(____),(____),(____),(____),(____)]:
        print(____)

示例

输入
solve()
期望输出
SUBMITTED -> ACTIVE: VALID
ACTIVE -> BLOCKED: VALID
BLOCKED -> ACTIVE: VALID
ACTIVE -> SUBMITTED: INVALID
CLOSED -> ACTIVE: INVALID
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