Not understand the editorial of string window

#1

i do not understand the solution of the problem,Not even algorithm of question
Please help me

#2

Algorithm
1.First check if the length of string is less than the length of the given pattern, if yes then “no such window can exist “.
2.Store the occurrence of characters of the given pattern in a hash_pat[].
3.Start matching the characters of pattern with the characters of string i.e. increment count if a character matches.
4.Check if (count == length of pattern ) this means a window is found.
5.If such window found, try to minimize it by removing extra characters from the beginning of the current window.
6.Update min_length.
7.Print the minimum length window.

#3

Please have a look at this short snippet for implementation of above algo.

#4

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