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Combinatorial Mathematical Strings

Factorial of a large number

Factorial of a non-negative integer, is multiplication of all integers smaller than or equal to n. For example factorial of 6 is 6*5*4*3*2*1 which is 720. We have di...
Hash Tree Amazon

Print a Binary Tree in Vertical Order Set 2 (Map based Method)

Given a binary tree, print it vertically. The following example illustrates vertical order traversal. 1 / 2 3 / / ...
Arrays Matrix School Programming

Print a given matrix in spiral form

Given a 2D array, print it in spiral form. See the following examples. Examples: Input: 1 2 3 4 5 6 7 8 9 10 11 12 ...

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