代码随想录算法训练营第八天 | 344.反转字符串 541. 反转字符串II 卡码网：54.替换数字

344.反转字符串

class Solution:
    def reverseString(self, s: List[str]) -> None:
        """
        Do not return anything, modify s in-place instead.
        """
        left, right = 0, len(s) - 1
        while(left < right):
            s[left], s[right] = s[right], s[left]
            left += 1
            right -= 1

541. 反转字符串II

class Solution:
    def reverseStr(self, s: str, k: int) -> str:
        for i in range(0, len(s), 2*k):
            s = s[:i] + s[i:i+k][::-1] + s[i+k:]

        return s

卡码网：54.替换数字

s = str(input())
s2 = ''
digits = '0123456789'
for i in range(len(s)):
    if s[i] in digits:
        s2 += 'number'
    else: s2 += s[i]
print(s2)

简单题秒了。