Vern  Greenholt

Vern Greenholt

1596737760

Search Sorted Matrix in Linear Time

Statement

We have to search for a value **x **in a sorted matrix M. If **exists, then return its coordinates **(i, j), else return (-1, -1).

Image for post

Let us consider the above matrix as an example. In this example, we are going to search for the value 12. Since 12 is present in the matrix, the algorithm should return its coordinates (2, 1)


Simple Approach

A simple approach is to traverse all the values in the matrix and check if it is equal to 12.

Image for post

The worst case time complexity of the above algorithm will be

_O(n x m) = O(n²) __when _n = m


Efficient Approach

The above algorithm behaves worse for large values of n and m. Let us look into the efficient algorithm now.

Algorithm

1\. Start from Top Right position (0, m - 1) in the matrix M
2\. If the value is equal to x return (0, m - 1)
3\. Move one row down if the current value is less than x
4\. Move one column left if the current value is greater than x

Let us apply this algorithm into our matrix M. We are going to search for the value 12 in M

#data-structures #search-sorted-matrix #2d-binary-search #algorithms #matrix-search #algorithms

What is GEEK

Buddha Community

Search Sorted Matrix in Linear Time
Vern  Greenholt

Vern Greenholt

1596737760

Search Sorted Matrix in Linear Time

Statement

We have to search for a value **x **in a sorted matrix M. If **exists, then return its coordinates **(i, j), else return (-1, -1).

Image for post

Let us consider the above matrix as an example. In this example, we are going to search for the value 12. Since 12 is present in the matrix, the algorithm should return its coordinates (2, 1)


Simple Approach

A simple approach is to traverse all the values in the matrix and check if it is equal to 12.

Image for post

The worst case time complexity of the above algorithm will be

_O(n x m) = O(n²) __when _n = m


Efficient Approach

The above algorithm behaves worse for large values of n and m. Let us look into the efficient algorithm now.

Algorithm

1\. Start from Top Right position (0, m - 1) in the matrix M
2\. If the value is equal to x return (0, m - 1)
3\. Move one row down if the current value is less than x
4\. Move one column left if the current value is greater than x

Let us apply this algorithm into our matrix M. We are going to search for the value 12 in M

#data-structures #search-sorted-matrix #2d-binary-search #algorithms #matrix-search #algorithms

I am Developer

1597475640

Laravel 7 Full Text Search MySQL

Here, I will show you how to create full text search in laravel app. You just follow the below easy steps and create full text search with mysql db in laravel.

Laravel 7 Full Text Search Mysql

Let’s start laravel full-text search implementation in laravel 7, 6 versions:

  1. Step 1: Install Laravel New App
  2. Step 2: Configuration DB .evn file
  3. Step 3: Run Migration
  4. Step 4: Install Full Text Search Package
  5. Step 5: Add Fake Records in DB
  6. Step 6: Add Routes,
  7. Step 7: Create Controller
  8. Step 8: Create Blade View
  9. Step 9: Start Development Server

https://www.tutsmake.com/laravel-full-text-search-tutorial/

#laravel full text search mysql #laravel full text search query #mysql full text search in laravel #full text search in laravel 6 #full text search in laravel 7 #using full text search in laravel

How to Install and Configure Chrony

It is essential to keep the correct time on a server. This is especially true when it comes to processing financial transactions or other vital functions which need to be handled in a specific order. Using the Network Time Protocol (or NTP), computers can synchronize their internal clock times with the internet standard reference clocks. In essence, NTP is a hierarchy of servers. The higher the Stratum number of a server, the more accurate the timing is and the lower the Stratum number of a server is, the lower the accuracy and time stability. Stratus are defined by the distance from the initial reference clock.

#tutorials #atomic clock #centos #chrony #clock #drift #internal time clock #network time protocol #ntp #offset #peers #pool.ntp.org #server time #stratum #system clock #time #time drift #timekeeping #ubuntu #utc

Ray  Patel

Ray Patel

1623892558

Search Emails From A Domain Through Search Engines for Python

EmailFinder

Search emails from a domain through search engines for python

Installation:

> pip3 install emailfinder

Upgrades are also available using:

> pip3 install emailfinder --upgrade

Search Engines

  • google: Ok (note cookies policy and Captcha!).
  • bing: OK.
  • baidu: OK (few requests).
  • bing: Hunting Robots very fast.

#email #python #search emails #search emails through search engines #search emails from a domain through search engines for python #domain

Hal  Sauer

Hal Sauer

1591688078

Python Datetime Tutorial: Manipulate Times, Dates, and Time Spans

Dealing with dates and times in Python can be a hassle. Thankfully, there’s a built-in way of making it easier: the Python datetime module.

datetime helps us identify and process time-related elements like dates, hours, minutes, seconds, days of the week, months, years, etc. It offers various services like managing time zones and daylight savings time. It can work with timestamp data. It can extract the day of the week, day of the month, and other date and time formats from strings.

#data science tutorials #calendar #date #dates #datetime #intermediate #python #time #time series #times #tutorial #tutorials