Perform String Shifts Python Solution

lcpy gen -n 1427   # by problem number
lcpy gen -s perform_string_shifts   # by problem name

Input: s = "abc", shift = [[0,1],[1,2]]
Output: "cab"
Explanation:
[0,1] means shift to left by 1. "abc" -> "bca"
[1,2] means shift to right by 2. "bca" -> "cab"

Input: s = "abcdefg", shift = [[1,1],[1,1],[0,2],[1,3]]
Output: "efgabcd"
Explanation:
[1,1] means shift to right by 1. "abcdefg" -> "gabcdef"
[1,1] means shift to right by 1. "gabcdef" -> "fgabcde"
[0,2] means shift to left by 2. "fgabcde" -> "abcdefg"
[1,3] means shift to right by 3. "abcdefg" -> "efgabcd"

class Solution:
    # Time: O(n + m) where n = len(s), m = len(shift)
    # Space: O(n) for the result string
    def string_shift(self, s: str, shift: list[list[int]]) -> str:
        offset = sum(amount if direction == 1 else -amount for direction, amount in shift)
        offset %= len(s)
        split = len(s) - offset
        return s[split:] + s[:split]