### checkInclusion 
from typing import *
def f_gold(s1, s2):
    """
    :type s1: str
    :type s2: str
    :rtype: bool
    """
    if len(s1) > len(s2):
        return False
    flag1 = [0] * 26
    flag2 = [0] * 26
    for i, x in enumerate(s1):
        flag1[ord(x) - ord('a')] += 1
    for i, x in enumerate(s2):
        flag2[ord(x) - ord('a')] += 1
        if i >= len(s1):
            flag2[ord(s2[i - len(s1)]) - ord('a')] -= 1
        if flag1 == flag2:
            return True
    return False