1.1 Implement an algorithm to determine if a string has all unique characters. Whatif you cannot use additional data structures?

CareerCup 1.1.py

def uniqueString(str):
	"Return True if the string has all unique characters."
	allChar = []
	for i in range(256):
		allChar.append(True)
	for char in str:
		if(allChar[ord(char)]):
			allChar[ord(char)] = False
		else:
			return False
	return True

Thanks for telling me that!