Бассейн и трубы

f = open('input.txt', 'r')
g = open("output.txt", "w")
l = [line.rstrip() for line in f]
a = []
b = []
flag = 0
 
for line in l:
    if flag == 0:
        if line != '':
            a.append(int(line))
        else:
            flag += 1
    else:
        c = line.split()
        for i in c:
            b.append(a[int(i) - 1])
            
g.write(str(60 / sum([1 / i for i in b])))
 
g.close()
f.close()

f = open('pipes.txt', 'r')
g = open('time.txt', 'w')
a = [int(st.rstrip()) for st in iter(f.readline, '\n')]
print(60/sum([1/a[int(x)-1] for x in f.readline().split()]), file=g)
f.close()
g.close()

f = open('pipes.txt', 'r')
f2 = open("time.txt", "w")
s = [line.rstrip() for line in f]
d = []
d1 = []
flag = 0
for i in s:
    if flag == 0:
        if i != '':
            d.append(eval(i))
        else:
            flag += 1
    else:
        s1 = i.split()
        for j in s1:
            d1.append(d[int(j) - 1])
f2.write(str(60 / sum([1 / i for i in d1]))) 
f2.close()
f.close()

with open('pipes.txt', encoding='utf-8') as file:
    data = file.read().split('\n')
data.remove('')
pipes = data[-1].split()
data.remove(data[-1])
with open('time.txt', 'w', encoding='utf-8') as answer:
    answer.write(str(60 / sum([1 / int(pipe) for pipe in pipes])))

with open('pipes.txt', encoding='utf-8') as file:
    time = file.read().split('\n')
while all(time) is False:
    time.remove('')
pipes = list(map(int, time[-1].split()))
time.remove(time[-1])
pipes = list(map(lambda x: x - 1, pipes))
time = [time[pipe] for pipe in pipes]
with open('time.txt', 'w', encoding='utf-8') as answer:
    answer.write(str(60 / sum(map(lambda x: 1 / float(x), time))))

with open('pipes.txt', mode='r', encoding='utf-8') as file:
    text = file.readlines()
 
trubProisv = [1 / float(i) if float(i) != 0.0 else 0 for i in text[:-2]]
su = 0
for i in list(map(int, text[-1].split())):
    su += trubProisv[i - 1]
fil = open('time.txt', mode='w', encoding='utf-8')
fil.write(str(1 / su * 60))