find the smallest sub-string?

Question

find the smallest sub-string in s1 containing all characters of s2 Ans : s2.substring(s1) is correct????

Afzaal Ahmad Zeeshan · Answer

When there always will be a shortest sub-string which would hold all of the characters of your first string then why create a sub-string why not use the initial value?

Khargesh Rajput · Answer

http://www.geeksforgeeks.org/find-the-smallest-window-in-a-string-containing-all-characters-of-another-string/

victor ebe · Answer

this is my interview question.... I need code for this..