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6 matches found for 'greedy algorithms'

Greedy Algorithms

There are many definitions of greedy algorithms, but in general, they have two properties: You build the solution by finding the most optimal answer at each local step. As you go through each local step, you do not backtrack; the answer you've picked for all of the previous steps remain the same.

October 28, 2018

Buy and Sell Two Stocks

Problem Given an array of integers representing stock prices, with each index representing a different day, find the maximum profit by selling at most two stocks. The buy/sell dates must not overlap.

December 10, 2018

Compute the max. water trapped by a pair of vertical lines

Problem An array of integers naturally defines a set of lines parallel to the Y-axis, starting from x = 0 as illustrated in the figure above. The goal of this problem is to find the pair of lines that together with the X-axis "trap" the most water.

February 5, 2019

Queue Reconstruction by Height

Problem Suppose you have a random list of people standing in a queue. Each person is described by a pair of integers (h, k), where h is the height of the person and k is the number of people in front of this person who have a height greater than or equal to h.

January 27, 2019

Algorithm Interview Problems

Welcome This page contains solutions to common interview problems that may be encountered. Arrays Longest Substring Without Repeating Characters Rotate a 2D Matrix Buy/Sell Two Stocks Merge Intervals Next Permutation Random Permutation Replace all occurrences of a space with a string Linked Lists Reversing sublists of singly linked lists Cycles in singly linked lists Overlapping singly linked lists Merging two sorted singly linked lists Merge k sorted lists Recursion Counting the path of sums Money Denominations Phone Number Mnemonics Unique Permutation Dynamic Programming Perfect Squares Find the Maximum Min Path Binary Trees Tree Symmetry Iterative In-Order Traversal of a Binary Tree Construct a Binary Tree from Pre-Order Traversal and In-Order Traversal BST Validate a BST Binary Heaps Merge k sorted lists Graphs Find a path in a maze from start to finish Flip colors in a matrix Search Search in a rotated sorted array Find the Duplicate Number Greedy Algorithms Queue Reconstruction By Height Trie Build a Trie in Python Invariant Compute the max.

January 25, 2019

Algorithm Handbook

Introduction Welcome to the algorithm handbook wiki! In this wiki you will find a mini-cheat sheet overview of data structures, and examples of their usages in modern languages. Algorithm problems can be found here.

June 18, 2017