python 482

https://leetcode-cn.com/problems/license-key-formatting/
快

class Solution:
    def licenseKeyFormatting(self, S: str, K: int) -> str:
        NewS = ''
        for i in range(len(S)):
            if S[i] !='-':
                NewS+=S[i]
        Left = len(NewS)%K
        R = ''
        if Left!=0:
            for i in range(Left):
                R+=self.upper(NewS[i])
            R += '-'
        NewS = NewS[Left:]
        for i in range(len(NewS)):
            R+=self.upper(NewS[i])
            if (i+1)%K == 0:
                R += '-'
        return R[:-1]
    def upper(self,s):
        if ord(s) <= ord('z') and ord(s) >= ord('a'):
            return chr(ord(s) - ord('a') + ord('A'))
        else:
            return s

慢

class Solution:
    def licenseKeyFormatting(self, S: str, K: int) -> str:
        N = 0
        L = len(S)
        R = ''
        for i in range(L):
            if S[L-i-1] != '-':
                N += 1
                R = self.upper(S[L-i-1]) + R
                if  N%K == 0:
                    R = '-' + R
        if len(R) ==0:
            return ''
        elif R[0] == '-':
            return R[1:]
        else:
            return R
    def upper(self,s):
        if ord(s) <= ord('z') and ord(s) >= ord('a'):
            return chr(ord(s) - ord('a') + ord('A'))
        else:
            return s