Topic: array-problem / Level: beginner

• 1. Find the sum of all elements in an array.
• 2. Find the maximum element in an array.
• 3. Find the minimum element in an array.
• 4. Reverse an array in place.
• 5. Count the occurrences of a given element in an array.
• 6. Check if an array is sorted in ascending order.
• 7. Check if an array contains a specific element.
• 8. Find the second largest element in an array.
• 9. Find the second smallest element in an array.
• 10. Merge two sorted arrays into a single sorted array.
• 11. Rotate an array to the left by k positions.
• 12. Rotate an array to the right by k positions.
• 13. Find the number of even elements in an array.
• 14. Find the number of odd elements in an array.
• 15. Find the average of all elements in an array.
• 16. Find the largest difference between two elements in an array.
• 17. Remove duplicates from an array.
• 18. Find the sum of all positive numbers in an array.
• 19. Find the sum of all negative numbers in an array.
• 20. Find the number of negative numbers in an array.
• 21. Find the product of all non-zero elements in an array.
• 22. Check if an array is a palindrome (i.e., reads the same forwards and backwards).
• 23. Find the missing number in an array of consecutive integers.
• 24. Find the first duplicate element in an array.
• 25. Separate even and odd numbers in an array.
• 26. Find the element with the highest frequency in an array.
• 27. Check if two arrays are equal (contain the same elements in the same order).
• 28. Sort an array of integers in ascending order using bubble sort.
• 29. Sort an array of integers in descending order using selection sort.
• 30. Find the longest subarray with consecutive integers in an array.
• 31. Find the sum of all prime numbers in an array.
• 32. Find the sum of the first n elements in an array.
• 33. Count how many elements in the array are greater than a given number x.
• 34. Replace all negative numbers in an array with zero.
• 35. Find the longest increasing subarray in an array.
• 36. Find the most frequent number in an array.
• 37. Find the maximum product of two distinct elements in an array.
• 38. Count how many numbers in an array are divisible by a given number k.
• 39. Swap the first and last elements of an array.
• 40. Count how many times a given number appears in an array.
• 41. Sort an array in ascending order using insertion sort.
• 42. Sort an array of integers in ascending order using quicksort.
• 43. Check if all elements in an array are distinct.
• 44. Find the kth smallest element in an array.
• 45. Find the kth largest element in an array.
• 46. Shift all zeros to the end of an array without changing the order of the other elements.
• 47. Find the smallest element in a 2D array.
• 48. Find the sum of the diagonal elements in a 2D array.
• 49. Find the product of the diagonal elements in a 2D array.
• 50. Find the row in a 2D array with the highest sum of elements.

• More Levels

• Intermediate
• Advanced