City Grid Distance

Manhattan distance is like walking through a city grid: you can move horizontally and vertically, but not diagonally. Given two points (x1, y1) and (x2, y2), return the distance between them using abs(x1 - x2) + abs(y1 - y2). This is useful for maps, grid-based games, and route calculations on rectangular layouts.

Примеры

Ввод
0, 0, 3, 4
Вывод
7
Ввод
1, 1, 1, 1
Вывод
0
Ввод
-2, -3, 2, 3
Вывод
10

Нужно реализовать

def manhattan(x1, y1, x2, y2):

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math
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