�� : ��

11.2

#1
def check(n, m):
    x = n * m
    am = 0

    while x % 10 == 0:
        x //= 10
        am += 1

    return True if am == 6 else False


with open("1.txt", "r") as file:
    file_data = file.read().splitlines()
    n = int(file_data[0])
    m = []
    am = 0

    for i in range(n):
        m.append(int(file_data[i + 1]))

    for i in range(n - 10):
        for j in range(i + 1, n):
            if check(n, m):
                am += 1

    print(am)

#2
def check(n, m):
    return True if (n + m) % 11 == 0 and n * m % 2310 == 0 else False


with open("1.txt", "r") as file:
    file_data = file.read().splitlines()
    n = int(file_data[0])
    m = []
    am = 0

    for i in range(n):
        m.append(int(file_data[i + 1]))

    for i in range(n - 10):
        for j in range(i + 1, n):
            if check(n, m):
                am += 1

    print(am)

#6
def check(n, m, k):
    return True if (n + m + k) % 7717 == 0 else False


with open("1.txt", "r") as file:
    file_data = file.read().splitlines()
    n = int(file_data[0])
    m = []
    am = 0

    for i in range(n):
        m.append(int(file_data[i + 1]))

    for i in range(n - 34):
        for j in range(i + 17, n - 17):
            for k in range(j + 17, n):
                if check(m[i], m[j], m[k]):
                    am += 1

    print(am)

#6
def check(n, m):
    return True if (n + m) % 4 == 0 and n * m % 9009 == 0 else False


with open("1.txt", "r") as file:
    file_data = file.read().splitlines()
    n = int(file_data[0])
    m = []
    am = 0

    for i in range(n):
        m.append(int(file_data[i + 1]))

    for i in range(n - 25):
        for j in range(i + 25, n - 25):
                if check(m[i], m[j]):
                    am += 1

    print(am)

��