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2. Balance the Warehouses
There are n warehouses in a row. Warehouse i holds stock[i] units. In one operation you can move a single unit to an adjacent warehouse.
Return the minimum number of operations so every warehouse holds the same number of units, or -1 if that is impossible.
Example 1Input: stock = [1, 0, 5] Output: 4Constraints
1 ≤ n ≤ 10⁵ 0 ≤ stock[i] ≤ 10⁴Seen in 14 OAs this season
1from typing import List2 3class Solution:4 def minOperations(self, stock: List[int]) -> int:5 total, n = sum(stock), len(stock)6 if total % n:7 return -18 9 target = total // n10 ops = carry = 011 # units that must cross each boundary12 for units in stock:13 carry += units - target14 ops += abs(carry)15 16 return opsStop practising blind.
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