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Posts Tagged “python”

Apply Discount To Prices leetcode solution

A sentence is a string of single-space separated words where each word can contain digits, lowercase letters, and the dollar sign '$'. A word represents a price if it is a sequence of digits preceded by a dollar sign...

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Sort Characters By Frequency solution leetcode

Given a string s, sort it in decreasing order based on the frequency of the characters. The frequency of a character is the number of times it appears in the string...

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Create a Lambda Function to run SQL queries in Redshift Cluster

Amazon Redshift is fully managed warehouse service provided by AWS. The Amazon Redshift engine is a SQL-compliant, massively-parallel, query processing and database management system designed to support analytics workload...

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Getting Started with decorators in Python

In python, everything is an object. So functons are also objects which can be passed around. A decorator is a function that receives a function and returns a function...

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Minimum Consecutive Cards to Pick up solution leetcode

An interesting problem on leetcode to find minimum number of ways to pick up consecutive cards. We will start with a brute force algorithm that would exceed in time limit. Later we will improve upon this algorithm using hashmap...

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Do you have triskaidekaphobia?

I grew up in India with a diet of basmati rice and superstition. I have seen pedestrians freezing at the sight of a black cat crossing their path for fear of bad luck. Lemon and chilis hang in front of vehicles to ward off bad spirits. I fondly remember numerous advertisements proclaiming protection from evil eyes. Recently I stumbled upon an ad that refreshed my memories...

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Creating Python AWS lambda layer with Docker

When you develop AWS lambda functions, you might feel the need to install additional `python` libraries. This can be achieved using Lambda layers that can be included in any lambda function...

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Leetcode - All Divisions With the Highest Score of a Binary Array

You are given a **0-indexed** binary array `nums` of length `n`. `nums` can be divided at index `i` (where `0 <= i <= n`) into two arrays (possibly empty) numsleft and numsright..

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Course Schedule Leetcode Solution

There are a total of numCourses courses you have to take, labeled from 0 to numCourses - 1. You are given an array prerequisites where prerequisites[i] = [ai, bi] indicates that you must take course bi first if you want to take course ai...

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Remove-all-adjacent-duplicates-in-string-ii Solution

You are given a string s and an integer k, a k duplicate removal consists of choosing k adjacent and equal letters from s and removing them, causing the left and the right side of the deleted substring to concatenate together...

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Lowest Common Ancestor of a Binary Tree

Questions involving the binary tree data structure are very popular in tech interviews, and can be challenging and varied! A binary tree is a data structure consisting of a collection of nodes (starting at a root node), where each node consists of a value (data), together with a directed edges to at most two nodes (the "left child" and "right child"), with the additional conditions that no two edges point to the same node and no edge points to the root. I recently solved an interesting problem on binary tree...

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Ternary String solution Codeforces - 1354B

Ternary string is an interesting problem that could be solved using two pointers techniques. It's a convenient way to keep track of multiple indices. This helps in making decisions based on two values...

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Coin Change solution leetcode

It's one of the most popular questions on leetcode that seems very easy at first. Coin change is a classic dynamic programming problem. I will proceed with an obvious (albeit wrong) solution and subsequently proceed to an efficient correct solution...

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Maximum Subarray

There's an interesting problem I recently solved on leetcode based on dynamic programming. My Github repository contains list of all problems that I have solved. I often start with a brute force approach without fretting about time complexity. Later I try to improve my algorithm for a better efficient solution...

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Getting Started with AWS CDK

Cloudformation service in AWS allows you to describe an entire set of resources required to make a pipeline. The cloudformation template can be described in JSON or YAML format. Updating the cloudformation template was not a pleasant experience. I wanted to discover alternative ways to generate cloudformation template programmatically...

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How to Make(Or Lose) Money in Stocks Part1

Recently I finished watching web-series Scam 1992. It's based on story of Harshad Mehta, a famous Indian stockbrocker who made fortunes in stocks. Despite his iconic success & failure, the series rekindled my interest in world of "stocks". I guess the famous dialogue "Risk Hai Toh Ishq Hai" has stuck with me...

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EnvCommandError in Windows using Poetry

Poetry is a great dependency management tool in python. It's better than managing a flat file like `requirements.txt`. There are also other great tools like pipenv. However I found poetry much simpler in resolving dependencies...

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Connect to an Oracle Database using kerberos with python

Jobs failed! Screamed an automatic failure alert in email inbox. Existing python scripts were failing in the server which fetched data from Oracle database. I wondered if the credentials had changed...

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