SDE - 1

You have been given a grid containing some oranges. Each cell of this grid has one of the three integers values:

Value 0 - representing an empty cell.

Value 1 - representing a fresh orange.

Value 2 - representing a rotten orange.

Every second, any fresh orange that is adjacent(4-directionally) to a rotten orange becomes rotten.

Your task is to find out the minimum time after which no cell has a fresh orange. If it's impossible to rot all the fresh oranges then print -1.

Note:

1. The grid has 0-based indexing.
2. A rotten orange can affect the adjacent oranges 4 directionally i.e. Up, Down, Left, Right.

You are given a binary tree, in which the data present in the nodes are integers. You are also given an integer X.

Your task is to delete all the leaf nodes with value X. In the process, if the newly formed leaves also have value X, you have to delete them too.

For example:

For the given binary tree, and X = 3:

Normal technical basic system design questions.
Some HR questions