力扣 1700. 无法吃午餐的学生数量

模拟1

def countStudents(students, sandwiches):
    s1 = sum(students)
    s0 = len(students) - s1
    for x in sandwiches:
        if x == 1 and s1:
            s1 -= 1
        elif x == 0 and s0:
            s0 -= 1
        else:
            break
    return s0 + s1

模拟2

def countStudents(students, sandwiches):
    cur, flag = len(sandwiches), True
    while flag:
        for i in range(cur):
            if sandwiches[0] == students[0]:
                sandwiches.pop(0)
                students.pop(0)
            else:
                students.append(students.pop(0))
        if cur == len(sandwiches):
            flag = False
        else:
            cur = len(sandwiches)
    return cur