Given a set of inputs <number, userid> in a log file: log: <number, userid> example: 1,2 1,1 2,1 3,1 1,2 out: <number, count> 1,2 2,1 3,1 The output should be all the unique numbers and the count associated with them.
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Design a linked list operation that takes a singly-linked list (only forward ptrs, no backward ptrs) as input and reverses the list.
You are given intervals of contiguous integers, like [1, 10), [15, 25), [40, 50), which are non-overlapping and of a fixed size. Design a data structure to store these intervals and have the operations of insert, delete, and find functions
It was a mathematical questions about finding the greatest number (but less than the given number) by reordering the digits in the number.
Check if a string is a pallindrome Find the longest distance between any two nodes in a binary tree.
2 leetcode easies, 2 leetcode mediums (Codesignal)
Sort a matrix in diagonal order after manipulation
Max Profit Buy Sell Stocks, K Closest Points to Origin and Copy List with Random Pointers
Diameter of binary tree. Find number of islands. Meeting room problem.
Coding question: Q. Given two non-negative integers low and high. Return the count of odd numbers between low and high
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