牛客网刷题-(8)

#税
s = float(input())
if s <= 2000:
    print("Isento")
elif 3000 >= s >= 2000.01:
    X = (s - 2000.01)*0.08
    print("R$ %.2f"%X)
elif 4500.00 >= s >= 3000.01:
    X = (s - 3000.01)*0.18 + (1000*0.08)
    print("R$ %.2f"%X)
else:
    X = (s - 4500.00)*0.28 + (1000*0.08) + (1500*0.18)
    print("R$ %.2f"%X)

x = float(input())
tot = 0
if x > 4500:
    tot += (x - 4500) * 0.28
    x = 4500
if x > 3000:
    tot += (x - 3000) * 0.18
    x = 3000
if x > 2000:
    tot += (x - 2000) * 0.08
    x = 2000
if tot == 0:
    print("Isento")
else:
    print("R$ %.2f" % tot)

#游戏时间2
a,b,c,d = map(int,input().split())
start = a * 60 + b
end = c  * 60 + d
# 当结束时间和开始时间位于同一天的时候
if end > start :
    x  = (end - start) / 60
    y  = (end - start) % 60
# 当结束时间和开始时间不是同一天的时候
if end <= start :
    x = (24 * 60 - start + end) / 60
    y = (24 * 60 - start + end) % 60
print("O JOGO DUROU %d HORA(S) E %d MINUTO(S)"%(x,y))

#求解一元二次方程的根
a,b,c =map(float,input().split())
if b ** 2 - 4 * a * c < 0 or a == 0 :
    print("Impossivel calcular")
else:
    R1 = (-b + (b ** 2 - 4 * a * c)**0.5 ) / (2 * a)
    R2 = (-b - (b ** 2 - 4 * a * c)**0.5 ) / (2 * a)
    print("R1 = %.5f"%R1)
    print("R2 = %.5f"%R2)

#求列表中所有元素之和
def sum_list(lst):
    total = 0
    for num in lst:
            total += num
    return total

my_list = [1, 2, 3, 4, 5, 7.5]
print(sum_list(my_list))  # 输出22.5

#递归
def list_sum(num_list):
    if len(num_list) == 1:
        return  num_list[0]
    else:
        return num_list[0] + list_sum(num_list[1:])
print(list_sum([1, 2, 3, 4, 5, 7.5]))