美式期权定价

def solve(____):
    q = (____ + r - d) / (____)
    discount = ____ / (____ + r)
    prices = [[____ for _ in range(____)] for _ in range(____)]
    for i in range(____):
        ST = S * (u ** (____)) * (____)
        prices[n][i] = max(____)
    for j in range(____):
        for i in range(____):
            ST = S * (u ** (____)) * (____)
            hold = discount * (q * prices[j + ____][i] + (____ - q) * prices[j + ____][i + ____])
            exercise = max(____)
            prices[j][i] = max(____)
    return {"____": n, "____": round(____)}