[sword finger offer] sword finger offer 58 - ii Rotate string left

subject
Code
Execution time ：36 ms, In all Python3 Defeated in submission 61.20% Users of
Memory consumption ：15 MB, In all Python3 Defeated in submission 78.80% Users of
Pass the test case ：34 / 34

class Solution:
    def reverseLeftWords(self, s: str, n: int) -> str:
        return s[n:]+s[:n]

【 Method 2】
Execution time ：36 ms, In all Python3 Defeated in submission 61.20% Users of
Memory consumption ：15.1 MB, In all Python3 Defeated in submission 38.62% Users of
Pass the test case ：34 / 34

class Solution:
    def reverseLeftWords(self, s: str, n: int) -> str:
        ans=[' ']*len(s)
        for i in range(len(s)):
            if i>=n:
                ans[i-n]=s[i]
            else:
                ans[len(s)-n+i]=s[i]        
        return "".join(ans)

【 Method 3】
Execution time ：36 ms, In all Python3 Defeated in submission 61.20% Users of
Memory consumption ：15.1 MB, In all Python3 Defeated in submission 37.15% Users of
Pass the test case ：34 / 34

class Solution:
    def reverseLeftWords(self, s: str, n: int) -> str:
        ans=[]
        for i in range(n,n+len(s)):
            ans.append(s[i%len(s)])
        return "".join(ans)