@khattri and khurana: traverse the string once. suppose the string is abcdeabcdeabcde take a hashtable (initially set the items to -1) .now hash as per khurana's idea till no duplicate occurs.Instead of marking 1. mark the array index in the hashtable. so in the hash table, we have a=0 b=1 c=2 d=3 e=4 instead of 1s and 0s... now 'a' comes again...it is non negative in the table.. max=current index(5) - a ki hash value(0) max=5-0=5 change the hash table value of a to new value 5. repeat.. correct me if i am wrong.. m a rookie
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