Program to Evaluate Postfix Expression – LeetCode
Given, an arithmetic expression. We need to Evaluate Postfix Expression, also known as Reverse Polish Notation. Operators include /,*,+,- and we will always return a finite result, there won’t be…
Strings
Balanced Parenthesis Program
We have an expression that contains brackets and alphanumeric characters, and we need to check whether the parenthesis are balanced or not. Balanced Parenthesis means an equal number of opening…
Anagram in Strings
Given, two strings and we need to check if those strings form an anagram. If you are wondering what’s an Anagram? When the characters of one word are obtained from…
Maximum Occurring Character in a String
Given, a String of Characters might be a mix of numbers, alphabets, and other special characters and we need to find the maximum occurring character and to do this we…
Sum of Numbers in a String
Today, I found a problem where we need to find the sum of numbers in a string, the string will be a mix of alphabets, numbers, and special characters, and…
Program to Validate Username
Today’s problem, write a program to validate username, similar to the Instagram username validation program, I came up with a simple solution in C++. The problem is very simple, we…