StackStalk
  • Home
  • Java
    • Java Collection
    • Spring Boot Collection
  • Python
    • Python Collection
  • C++
    • C++ Collection
    • Progamming Problems
    • Algorithms
    • Data Structures
    • Design Patterns
  • General
    • Tips and Tricks

Tuesday, July 10, 2012

Find the longest palindrome in a string

 July 10, 2012     Programming problems in CPP     No comments   

Write a program to find the longest palindrome in a string

The approach:-
  1. From each character location, compare the left and right locations for equality.
  2. Remember the location and maximum size of equality.
  3. Print the string starting from the location minus maximum size to location plus maximum size, which is the longest palindrome.

C++ program to find the longest palindrome in a string

#include <iostream>
#include <cstring>
using namespace std;

int main() {
   char input[] = "jsdfjdsfhracecarksdfjsdkfmalayalamcheck";
   char* ptr = input;

   int location = 0;
   int maxsize = 0;
   for ( int i = 0; i < strlen(input) - 1; i++ ) {
       int left = i;
       int right = i;
       int count = 0;
       while ( left > 0 ) {
           if ( input[left--] != input[right++] ) {
               break;
           }
           count++;
       }
       if ( count > maxsize ) {
          maxsize = count;
          location = i;
       }
   }

   cout << maxsize << " @ " << location << endl;
   int start = location - maxsize;
   int end = location + maxsize;
   for ( int i = start + 1; i < end; i++ ) {
       cout << input[i];
   }
   return 0;
}
Output:-
5 @ 29
malayalam
Email ThisBlogThis!Share to XShare to Facebook
Newer Post Older Post Home

0 comments:

Post a Comment

Follow @StackStalk
Get new posts by email:
Powered by follow.it

Popular Posts

  • Python FastAPI file upload and download
    In this article, we will look at an example of how to implement a file upload and download API in a Python FastAPI microservice. Example bel...
  • Avro Producer and Consumer with Python using Confluent Kafka
    In this article, we will understand Avro a popular data serialization format in streaming data applications and develop a simple Avro Produc...
  • Monitor Spring Boot App with Micrometer and Prometheus
    Modern distributed applications typically have multiple microservices working together. Ability to monitor and manage aspects like health, m...
  • Accessing the Kubernetes API
    In this article, we will explore the steps required to access the Kubernetes API and overcome common challenges. All operations and communic...
  • Server-Sent Events with Spring WebFlux
    In this article we will review the concepts of server-sent events and work on an example using WebFlux. Before getting into this article it ...
  • Python FastAPI microservice with Okta and OPA
    Authentication (AuthN) and Authorization (AuthZ) is a common challenge when developing microservices. In this article, we will explore how t...
  • Going Serverless with KNative
    Serverless computing has rapidly gained popularity in recent years as it provides a platform for developers to deploy their applications wit...
  • Scheduling jobs in Python
    When developing applications and microservices we run into scenarios where there is a need to run scheduled tasks. Examples include performi...

Copyright © StackStalk