Tag Archives: C++

Hackerearth Min-Max


partially accepted code with vector:


2d Array Explained Perfectly



Another Good Example:





A good Array Example

Hackerrank problem:


Depth Firtst Search(DFS) Algorithm Explanation and Implementation in C++

Discovery Time and Finishing Time Code:



Pseudocode from shafayet vai’s blog:



Another code to find the order of the node:
One of my classmates blog link: http://programminghelpbd.blogspot.com/2014/06/breadth-first-search-dfs-in-java.html
and this ppt : https://drive.google.com/file/d/0B0sCkwd_qKgJZEJzS1pWeXNmNUE/edit
CLRS website: http://www.personal.kent.edu/~rmuhamma/Algorithms/MyAlgorithms/GraphAlgor/depthSearch.htm

Shafayet Ashraf: http://www.shafaetsplanet.com/planetcoding/?p=973

saurabhschool youtube link : https://www.youtube.com/watch?v=gCNsAKkUHPM

Youtube video of Mifta Sintaha:

and here is also a good implementation:

Java array basics: http://www.tutorialspoint.com/java/java_arrays.htm

Another code to find the order of vertices:


C++ OOP: Constructor Destructor

The class constructor:

A class constructor is a special member function of a class that is executed whenever we create neww objects of that class

A costructor will have exact same name as the class and it does not have any return type at all, not even void.Constructors can be very useful for setting initial values for certain member variables.

Following example wxpalins the concept of constructor:

Parameterized Constructor:

A default constructor does not have any parameter, but if you need, a constructor can have parameters.This helps yout to assign initial value to an object at the time of its creation as shown in the example:

2015-09-30 14_02_06-_D__desktop_desktop september_oop_param.exe_

Using Initialization Lists to Initialize Fields:

In case of parameterized constructor, you can use following syntax to initialize the fields:

Above syntax is equal to the following syntax:

If for a class C, you have multiple fields X,Y,Z etc. to be initialized, then can be use same syntax and separate the fields by comma as follows:


The class Destructor:

A destructor is a special member fucntion that is executed whenever an object of it’s class goes out of scope or whenever the delete expression is applied to a pointer to the object of that class.

A destructor will have exact same name as the class prefixed with a tilde(~) and it can neither return a value nor can it take any paramaters.Destructor can be very useful for releasing resources before coming out of the program liek

2015-09-27 00_53_49-_D__desktop_desktop september_oop_destructor.exe_

Function in C++


return will work for any function_type except void….void does not return any value but it returns..so we can use return keyword in void to exit but no value after return keyword  in void method / function

Normally we have to declare function protoype if we add the calling function after the main function

We can also use without function prototype when main function is after the calling function

We can also use function when there is not equal parameter is passing like

One example below created by me:

Another example

Recursive function: Factolrial

Another one:


C++ Functioon Call By Value


C++ Function call by Reference

C++ Function call by Pointer