Encode and Decode Strings (LC 271)

Link to free version of problem: https://www.lintcode.com/problem/659/

Time complexity: $O(n)$

def encode(self, strs):
	result = ""
	for s in strs:
		result += str(len(s)) + "#" + s
	return result
 
def decode(self, str):
	result = []
	i = 0
 
	while i < len(str):
		j = i
		while str[j] != "#":
			j += 1
		length = int(str[i:j])
 
		result.append(str[j+1 : j+1+length])
 
	return result

/box