Interview coding resources

https://coderpad.io/ 

https://www.algoexpert.io/product 

https://leetcode.com/ 

https://www.hackerrank.com/ 

https://kodekloud.com/ 

Interview questions

Check for a permutation of s1 in s2

A = [ord(x) - ord('a') for x in s1]

B = [ord(x) - ord('a') for x in s2]

target = [0] * 26

for x in A:

    target[x] += 1

window = [0] * 26

for i, x in enumerate(B):

    window[x] += 1

    if i >= len(A):

        window[B[i - len(A)]] -= 1

    if window == target:

        return True

return False