What does the line hash_pat[pat[i]]++ mean

#1

what does the line hash_pat[pat[i]]++ mean

#2

hash_pat is a hashmap for the character to frequency mapping of the pattern.
So hash_pat[pat[i]]++ means that the frequency of character pat[i] is being incremented in the map by 1.

#3

also will it be possible to give the code of brute force approach

#4

code is not available with us. You can try it yourself. If you are not able then you can post it as a doubt.

#5

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