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Design a stack with push, pop, and min operations in constant time.
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Algorithms, Data Structures and Coding
A stack is a data structure that supports push, pop, and min operations in constant time.
Fibonacci Sequence
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Algorithms, Data Structures and Coding
The Fibonacci sequence is a series of numbers in which each number is the sum of the two preceding numbers. The first two numbers in the sequence are 1 and 1, and the third number is 2. The fourth number is 3, the fifth number is 5, and so on. The function takes in a number n and prints out the first n numbers of the Fibonacci sequence .
Find the length of the smallest subarray whose sum is greater than or equal...
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Algorithms, Data Structures and Coding
Given an array of positive integers and a positive integer s, this function returns the minimal length of a contiguous subarray of which the sum is greater than or equal to s. If there isn 't one, it returns 0 instead.
Minimum path sum in a 2D array
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Algorithms, Data Structures and Coding
Find the minimum path sum in a 2D array from the top-left corner to the bottom-right corner.
Find the maximum average value in a given array of integers.
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Algorithms, Data Structures and Coding
Given an array of n integers, find the contiguous subarray of given length k that has the maximum average value. Output the maximum average value.
Checking if a Binary Tree is a Mirror Image of Itself
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Algorithms, Data Structures and Coding
Given a binary tree, this function checks whether it is symmetrical around its center. For example, the first tree in the input is symmetrical, but the second one is not.
Two Number Sum: Given a list of integers, return the indices of the two...
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Algorithms, Data Structures and Coding
Given a list of integers and a target sum, return the indices of the two numbers that add up to the target sum.
Determining Validity of Strings with Brackets
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Algorithms, Data Structures and Coding
This technical problem deals with determining whether or not a given string consisting of only brackets is valid. A string is considered valid if the open brackets are closed by the same type of brackets in the correct order. An empty string is also considered valid.