11.3. Новогодний бал

11_3.py

with open("input.txt", "r") as fi:
    n = int(fi.readline())
    boys = list(map(int, fi.readline().split(" ")))
    m = int(fi.readline())
    girls = list(map(int, fi.readline().split(" ")))

boys.sort()
girls.sort()

j = m - 1
c = 0
for i in range(n - 1, -1, -1):
    while j >= 0 and girls[j] > boys[i]:
        j -= 1

    if j < 0:
        break
    else:
        c += 1
        j -= 1

with open("output.txt", "w") as fo:
    fo.write(str(c))