Solution to JZ 05 and JZ 58 II.
JZ 05
(Easy) [link]
class Solution:
def replaceSpace(self, s: str) -> str:
cnt = s.count(' ')
res = list(s)
res.extend([' '] * cnt * 2)
left, right = len(s)-1, len(res)-1
while left >= 0:
if res[left] != ' ':
res[right] = res[left]
right -= 1
else:
res[right-2: right+1] = '%20'
right -= 3
left -= 1
return ''.join(res)
JZ 58
(Easy) [link]
class Solution:
def reverseLeftWords(self, s: str, n: int) -> str:
s = list(s)
s[:n] = list(reversed(s[:n]))
s[n:] = list(reversed(s[n:]))
s.reverse()
return ''.join(s)
class Solution:
def reverseLeftWords(self, s: str, n: int) -> str:
def reverse_fn(s, left, right):
while left < right:
s[left], s[right] = s[right], s[left]
left += 1
right -= 1
s = list(s)
end = len(s)-1
reverse_fn(s, 0, n-1)
reverse_fn(s, n, end)
reverse_fn(s, 0, end)
return ''.join(s)
