My software development journey
Stack is one of the most widely used data structure. In this post we will learn how to use the stack container (data structure) provided by C++ STL with an example. Let us consider the following problem. We have a string which contains only ‘(‘ and ‘)’ characters. We have to write a program to…
Map is one of the most useful data structure in solving many programming problems. Today we will see how to use C++ STL map with a simple example. Counting the frequency of letters in a given string. The map data structure stores <key,value> pairs. In this example key will be the character, and the value…
In Competitive programming, learning to use the standard library than coding from scratch saves a lot of time. In this post we will use C++ STL(Standard Template Library) binary search algorithm with an example.Given a sorted array of numbers, How to find the frequency of a given number? Here is an efficient algorithm to do…
Given a list of numbers. How do we write a program to find the duplicates among them?A simple algorithm is to compare each possible pair in the list to see if there are any duplicates. But this algorithm runs in O(n2) time. We can use the following simple algorithm using the set data structure. This…