Gang Wang gwang

gwang / gist:39ffce190d7d3a98b8b8

Last active August 29, 2015 14:14

Rotate a potentially large string about a pivot point

	#include <stdlib.h>
	#include <stdio.h>

	void reverse(char *data, int start, int end)
	{
	int i; char tmp;

	for (i=0; i<(end-start)/2; i++)
	{
	tmp = data[i+start];

gwang / per_com.rb

Last active December 22, 2015 01:28

compute the permutation and combination of a string (or a collection of characters)

	def permutation(data, used=nil, prev='')
	used = Array.new(data.size) if used == nil

	(0..data.size-1).each do \|i\|
	result = prev
	if used[i] == false \|\| used[i] == nil
	used[i] = true
	result += data[i]
	if result.length == data.size
	puts result

gwang / bingo.txt

Created May 11, 2012 04:43

Multiplication Bingo in Tcl Using SAPI

gwang / gist:2657578

Created May 11, 2012 04:40

Multiplication Bingo in Ruby Using SAPI