Amazon Online Assessment 2021 (OA) - Shipment Imbalance

Amazon logistics has multiple delivery centers from which products are sent.

In one such delivery center, parcels are placed in a sequence where the i-th parcel has a weight of weight[i]. A shipment is constituted of a contiguous segment of parcels. The shipment imbalance of a shipment is defined as the difference between the max and min weights within a shipment.

Given the arrangement of parcels, find the sum of shipment imbalance of all the shipments that can be formed from the given sequence of parcels.

Relevant Amazon OA Problems:


  • weights: an array of integers that denote the weights of parcels


the sum of shipment imbalance


Example 1:


1weights = [1, 3, 2]

Output: 5


The shipment imbalance calculations for each possible shipment are shown below.

ShipmentsMax WeightMin WeightImbalance
1 ,3, 2111-1=0
1, 3, 2333-3=0
1, 3, 2222-2=0
1, 3, 2313-1=2
1, 3, 2323-2=1
1, 3, 2313-1=2

The total imbalance is 0+0+0+2+1+2=5.

Try it yourself




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1  >>> a = [1, 2, 3]
2  >>> a[-1]
3  3

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