It this post you can find a function in C which is a able to find X minimum or maximum elements in a given array, order the output either ascended or descended and get either distinct elements or duplications. Of course this function is far away from optimal solutions as it is better to use specific algorithms depending on your needs, however for fast experimentation it is useful. You can use...

## Find masked pattern in 1D array – C source code

The following example finds the first occurrence of pattern in a given array and returns the address of that position. Moreover it takes into account a mask, which is helpful for inconsistent pattern formats like : 2,3,X,X,3,1 where X should be ignored. Below you will find the source code and a working sample.

## HDC2010 – Low Power Humidity and Temperature Digital Sensor | Simple Example

HDC2010 is an integrated humidity and temperature sensor that provides high accuracy measurements with very low power consumption, in an ultra-compact WLCSP (Wafer Level Chip Scale Package). Below you will find a simple example to get temperature and humidity of this sensor by connecting it via I2C to an STM32 microcontroller.

## The problem of “Poisonous Plants” – C Source code

There are a number of plants in a garden. Each of these plants has been treated with some amount of pesticide. After each day, if any plant has more pesticide than the plant on its left, being weaker than the left one, it dies. You are given the initial values of the pesticide in each of the plants. Print the number of days after which no plant dies, i.e. the time after which there are no plants...

## The problem of “Arrays: Left Rotation” – C Source code

A left rotation operation on an array shifts each of the array’s elements 1 unit to the left. For example, if 2 left rotations are performed on array [1,2,3,4,5], then the array would become [3,4,5,1,2]. Given an array a of n integers and a number, d, perform d left rotations on the array. Return the updated array to be printed as a single line of space-separated integers. More information...

## The problem of “New Year Chaos” – C Source code

It’s New Year’s Day and everyone’s in line for the Wonderland rollercoaster ride! There are a number of people queued up, and each person wears a sticker indicating their initial position in the queue. Initial positions increment by 1 from 1 at the front of the line to n at the back. Any person in the queue can bribe the person directly in front of them to swap positions. If two...

## The problem of “Castle on the Grid” – C++ Source code

You are given a square grid with some cells open (.) and some blocked (X). Your playing piece can move along any row or column until it reaches the edge of the grid or a blocked cell. Given a grid, a start and an end position, determine the number of moves it will take to get to the end position. For example, you are given a grid with sides n=3 described as follows:. . .. X .. . . Your starting...

## The problem of “Repeated String” – C Source code

Lilah has a string, s , of lowercase English letters that she repeated infinitely many times. Given an integer, n, find and print the number of letter a‘s in the first n letters of Lilah’s infinite string. For example, if the string s=’abcac’ and n=10, the substring we consider is ‘abcacabcac’ , the first 10 characters of her infinite string. There are...

## The problem of “Sock Merchant” – C Source code

John works at a clothing store. He has a large pile of socks that he must pair by color for sale. Given an array of integers representing the color of each sock, determine how many pairs of socks with matching colors there are. For example, there are socks n=7 with colors ar=[1,2,1,2,1,3,2] . There is one pair of color and one of color . There are three odd socks left, one of each color. The...

## The problem of “Counting Valleys” – C Source code

Gary is an avid hiker. He tracks his hikes meticulously, paying close attention to small details like topography. During his last hike he took exactly n steps. For every step he took, he noted if it was an U uphill, , or a D downhill, step. Gary’s hikes start and end at sea level and each step up or down represents a unit change in altitude. We define the following terms: A mountain is a...