Given a binary tree, print the average of each level.
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Given an unsorted string, determine if it can be presented as a palindrome. 'MMO'-True, 'DOOR'-False
1. Tell me about yourself 2. Given each abc letter has a value (a=1, b=2, ... , z=26), compute the number of ways one can decode a given integer. e.g. 23 --> 2 [ 2, 3 ; 23 ], 456 --> 1 [ 4, 5, 6 ], 123 --> 3 [ 1, 2, 3 ; 1, 23 ; 12, 3 ]
Give the count and the number following in the series. for e.g 1122344 first line output : 21221324 next line : 12112211121214 and so on...
Given array find 3 elements that sum up to 0.
Given a binary tree, which is not necessarily balanced, print the nodes in the tree in a level-wise manner. Also, nodes on the same level should be printed on a single line. A modification of the question was added later in which I cannot really add a "level" variable in the structure of the node in the tree.
Create a data structure that minimizes time complexity of retrieving median and inserting new element. Getting median should be O(1) and insertion should be O(log(n)).
Write an algorithm to verify if a tree is a binary search tree.
Divide two numbers without using / or % and return quotient.
Find the two largest numbers in an array
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