백준 12891: DNA 비밀번호

https://www.acmicpc.net/problem/12891

12891번: DNA 비밀번호

import sys
input = sys.stdin.readline
 
checkList = [0]*4
myList = [0]*4
checkSecret = 0
 
def myadd(c):
    global checkList, myList, checkSecret
    if c == 'A':
        myList[0] +=1
        if myList[0]==checkList[0]:
            checkSecret +=1
    elif c == 'C':
        myList[1] +=1
        if myList[1]==checkList[1]:
            checkSecret +=1   
    elif c == 'G':
        myList[2] +=1
        if myList[2]==checkList[2]:
            checkSecret +=1   
    elif c == 'T':
        myList[3] +=1
        if myList[3]==checkList[3]:
            checkSecret +=1 
 
def myremove(c):
    global checkList, myList, checkSecret
    if c == 'A':
        if myList[0]==checkList[0]:
            checkSecret -=1
        myList[0]-=1
    elif c == 'C':
        if myList[1]==checkList[1]:
            checkSecret -=1
        myList[1]-=1 
    elif c == 'G':
        if myList[2]==checkList[2]:
            checkSecret -=1
        myList[2]-=1  
    elif c == 'T':
        if myList[3]==checkList[3]:
            checkSecret -=1
        myList[3]-=1
 
s, p = map(int, input().split())
result = 0
 
a = list(input())
checkList = list(map(int, input().split()))
 
for i in range(4):
    if checkList[i]==0:
        checkSecret+=1
 
for i in range(p):
    myadd(a[i])
if checkSecret == 4:
    result +=1
 
for i in range(p,s):
    j=i-p
    myadd(a[i])
    myremove(a[j])
    if checkSecret == 4:
        result +=1
print(result)