1class Solution:
2 def decode(self, s):
3 res, num = [], 0
4 for i in range(len(s)):
5 if s[i].isnumeric():
6 num *= 10
7 num += int(s[i])
8 else:
9 res.append(num * s[i])
10 num = 0
11
12 return "".join(res)
13
14 def encode(self, s):
15 if len(s) == 0: return ""
16 res = []
17 count, curr = 0, ""
18 for i in range(len(s)):
19 if curr != s[i]:
20 if curr != "": res.extend([str(count), curr])
21 count = 1
22 curr = s[i]
23 else: count += 1
24
25 res.extend([str(count), curr])
26
27 return "".join(res)