Single-Row Keyboard Python Solution with Tests

lcpy gen -n 1165   # by problem number
lcpy gen -s single_row_keyboard   # by problem name

Input: keyboard = "abcdefghijklmnopqrstuvwxyz", word = "cba"
Output: 4
Explanation: The index moves from 0 to 2 to write 'c' then to 1 to write 'b' then to 0 again to write 'a'.
Total time = 2 + 1 + 1 = 4.

Input: keyboard = "pqrstuvwxyzabcdefghijklmno", word = "leetcode"
Output: 73

class Solution:
    # Time: O(n + 26)
    # Space: O(26)
    def calculate_time(self, keyboard: str, word: str) -> int:
        pos = {char: i for i, char in enumerate(keyboard)}
        total = current = 0
        for char in word:
            target = pos[char]
            total += abs(target - current)
            current = target
        return total