Amazon Online Assessment 2021 (OA) - Grid Connections

A supply chain manager at Amazon Logisitcs wants to determine the number of connections between warehouses, represented as nodes on a grid. A grid with m rows and n columns is used to form a cluster of nodes. If a point in the grid has a value of 1, then it represents a node.

Each node in the cluster has a level associated with it. A node located in the ith row of the grid is a level inode.

Here are the rules for creating a cluster:

  • Every node at a level connects to the next level that contains at least 1 node (i.e., every node at level i connects to all the nodes at level k where k > i and k is the first level after level i than contains at least one note).
  • When i reaches the last level in the grid, no more connections are possible.

Given such a grid, please help the supply chain manager by finding the number of connections present in the cluster.

Relevant Amazon OA Problems:

Input

  • grid: the nodes grid

Output

the total number of connections

Examples

Example 1:

Input:

1grid = [[1, 1, 1], [0, 1, 0], [0, 0, 0], [1, 1, 0]]

Output: 5

Explanation:

image

There are a total of 3+2=5 connections.

Try it yourself

Solution

Title

Script

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book.

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

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