1.4 Write a method to replace all spaces in a string with'%20'. You may assume that the string has sufficient space at the end of the string to hold the additional characters, and that you are given the "true" length of the string. (Note: if implementing in Java, please use a character array so that you can perform this operation in place.)

CareerCup 1.4.py

def replaceSpace(string):
	"""Replace all spaces in a string with '%20'"""

	"Split string by space, save into a list"
	newList = string.split()

	"str.join concatenate list at the end"
	newString = "%20".join(newList)

	return newString

in this case the time complexity might be O(n), since you use a list to store the splited strings.