Topic: language-problem / Level: intermediate

• 1002. Write a program to reverse a string in place.
• 1003. Write a program to implement a basic calculator using switch-case statements.
• 1004. Write a program to find the factorial of a number using recursion.
• 1005. Write a program to check if a string is a palindrome.
• 1006. Write a program to implement a simple queue using an array.
• 1007. Write a program to sort an array of integers using the quicksort algorithm.
• 1008. Write a program to count the number of vowels in a given string.
• 1009. Write a program to implement a binary search algorithm.
• 1010. Write a program to find the maximum and minimum elements in an array.
• 1011. Write a program to remove all whitespace from a string.
• 1012. Write a program to merge two sorted arrays into one sorted array.
• 1013. Write a program to calculate the power of a number using a function.
• 1014. Write a program to check if a given number is prime.
• 1015. Write a program to find the longest common substring between two strings.
• 1016. Write a program to implement a basic linked list with insert and delete operations.
• 1017. Write a program to find the second largest element in an array.
• 1018. Write a program to print the Fibonacci series up to n terms using iteration.
• 1019. Write a program to implement a stack using an array.
• 1020. Write a program to check if two strings are anagrams.
• 1021. Write a program to rotate an array to the left by k positions.
• 1022. Write a program to find the GCD of two numbers using the Euclidean algorithm.
• 1023. Write a program to find the LCM of two numbers.
• 1024. Write a program to implement a basic text editor.
• 1025. Write a program to count the frequency of each character in a string.
• 1026. Write a program to calculate the sum of digits of a number using recursion.
• 1027. Write a program to find the number of words in a sentence.
• 1028. Write a program to implement a simple binary search tree.
• 1029. Write a program to find the intersection of two arrays.
• 1030. Write a program to determine if a string contains all unique characters.
• 1031. Write a program to implement a basic online quiz.
• 1032. Write a program to find the longest increasing subsequence in an array.
• 1033. Write a program to calculate the average of an array of integers.
• 1034. Write a program to implement a simple hash table.
• 1035. Write a program to find the first non-repeating character in a string.
• 1036. Write a program to implement a basic ticket booking system.
• 1037. Write a program to check if a number is a perfect square.
• 1038. Write a program to implement a basic memory management simulation.
• 1039. Write a program to find the maximum sum of a subarray using Kadane’s algorithm.
• 1040. Write a program to sort an array of strings based on their lengths.
• 1041. Write a program to convert a string to an integer without using built-in functions.
• 1042. Write a program to check if two strings are rotations of each other.
• 1043. Write a program to implement a simple ATM simulation.
• 1044. Write a program to calculate the sum of all even numbers in a range.
• 1045. Write a program to check if a given string is a valid email address.
• 1046. Write a program to find the mode of a set of numbers.
• 1047. Write a program to implement a basic note-taking application.
• 1048. Write a program to calculate the factorial of a number using memoization.
• 1049. Write a program to check if a number is a Harshad number.
• 1050. Write a program to implement a simple spell checker.
• 1051. Write a program to find the sum of the digits of a number until a single digit is obtained.

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