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# Raunak Ramakrishnan rrampage

• India
Created June 2, 2013 09:56 — forked from jasonrudolph/about.md

# Programming Achievements: How to Level Up as a Developer

Last active December 18, 2015 12:19
Given a positive integer n, sort numbers from 1 to n with increasing number of bits set. If two numbers have same number of bits set, the lower number will come first. (From Codebunk FB Page)
View Sort by 1's.py
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 """Using the implementation from Wikipedia: https://en.wikipedia.org/wiki/Hamming_weight#Efficient_implementation """ def hamming_weight(n): t1 = n - ((n>>1) & 0x55555555) t2 = (t1 & 0x33333333) + ((t1 >> 2) & 0x33333333) return ((((t2 + (t2 >> 4)) & 0x0F0F0F0F) * 0x01010101) >> 24,n) def hamming_sort(n): return [x for x in sorted(map(hamming_weight,xrange(1,n+1)))]
Created October 13, 2017 14:27
Keybase
View keybase.md

### Keybase proof

I hereby claim:

• I am rrampage on github.
• I am raunak (https://keybase.io/raunak) on keybase.
• I have a public key ASBUeum7e_np2neA9YXi60A7YLGFHk9yI9n3VCNsKgQSIwo

To claim this, I am signing this object:

Last active July 14, 2018 17:11
Check if two strings are anagrams in O(n) time
View check_perm.py
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 # Check if two strings are permutations (anagrams) of each other # For this example, using just the lowercase ASCII letters as the alphabet # Step 1 : Generate k primes using Sieve of Erasthothenes # Step 2 : Map characters in alphabet to prime # Step 3 : Compare the products of the 2 strings # Why does this work? # - Multiplication is commutative i.e a * b * c = c * a * b # - Fundamental theorem of arithmetic i.e every natural number can be expressed uniquely as either a prime or a product of primes (https://en.wikipedia.org/wiki/Fundamental_theorem_of_arithmetic) from string import ascii_lowercase as ALPHABETS