Implement Stack using Queue

Implement Stack using Queue in Java

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You are given a Queue data structure that supports standard enQueue and deQueue operations. 
You need to implement Stack data structure using Queue instances.

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Find Smallest and Second smallest element in array.

Find Smallest and Second smallest number in array.

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Given a integer array, find smallest and second smallest number in array.

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Find smallest and second smallest element in an array in Java

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Find Largest and Second Largest number in array

Find Largest and Second Largest number in array

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Given a integer array, find largest and second largest number in array.

Lets understand the problem statement graphically and it will be more clear,

Find the largest and second largest element in an array

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Find Largest and Second Largest number in array and Find Smallest and Second Smallest number in array

Find Largest and Second Largest number in array OR Find the smallest and second smallest element in array.

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Given a integer array, find largest and second largest number in array. 

Lets understand the problem statement graphically and it will be more clear,

Find largest and second largest number in array

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Find Largest and Smallest number in Array

Find minimum and maximum number in array

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Given a integer array, find minimum and maximum number in array.

Lets understand the problem statement graphically and it will be more clear,

Find minimum and maximum element in an array in Java

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Count zeros in a row wise and column wise sorted matrix

Count zeros in sorted matrix

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Count zeros in a row wise and column wise sorted matrix Lets understand the problem statement graphically and it will be more clear,

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Search in a row wise and column wise sorted matrix

Find number in sorted matrix

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Given an n x n matrix, where every row and column is sorted in increasing order.  Given a number k, how to decide whether this k is in the matrix. OR Search number in a row wise and column wise sorted matrix.

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Find middle element of a linked list

Find middle element of a linked list in Java

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Given a singly linked list find middle of the linked list.

Find Nth node from last in a linked list

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Convert Sorted Linked List to balanced BST

Convert Sorted Linked list to balanced Binary Search Tree

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Convert sorted list to binary search tree

Lets simplify the question statement, Given a singly Linked List where elements are sorted in  ascending order convert it to a height balanced BST.

A Binary Search Tree is called balanced if the height of left subtree and height of right subtree of Root differ by at most 1.

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Sorted Array to Balanced Binary Search Tree (BST)

Convert Sorted Array to Balanced Binary Search Tree

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Given a sorted array, create a Balanced Binary Search Tree using array elements. A Binary Search Tree is called Balanced if, the height of left subtree and height of right subtree of Root differ by at most 1.

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