Featured Lists Top 20 Problems on Dynamic programming Top 10 Problems on Backtracking Top 20 Problems on Graph Top 25 Problems on Trees Top 10 Problems on Bits Manipulation Top 15 Problems in LinkedList All Problems # Status Problem video Level Completes Likes 541 Find an extra element in two almost similar arrays Beginner % 5 540 find the Arithmetic Progression sequence Beginner % 3 539 Find the Nth-term in a given arithmetic progression Beginner % 1 536 Given an array, rank its elements Beginner % 3 525 Find the number of pairs with odd XOR Beginner % 2 516 Count similar words in a given array Beginner % 1 123 Colorful Numbers Hard % 2 535 Find Three Consecutive Odd Numbers in an array Beginner % 2 531 Convert a Decimal number to its binary representation Beginner % 1 530 Maximum Consecutive Ones in a given array Beginner % 0 527 In a number, add digits until it becomes a single digit Beginner % 1 496 Minimum number of times String A is repeated to such that B is substring of A Beginner % 1 549 Dynamic Programming - Minimum Cost for Climbing Stairs Medium % 0 545 Maximizing Contiguous Ones with a Single Flip in a Binary Array Medium % 3 513 Sort 0, 1, 2 in an array - Part 1 Beginner % 1 151 Breadth-First Search/Traversal in a Binary Tree Beginner % 0 58 All Permutations of a String Hard % 0 36 Find the Maximum Depth OR Height of a Binary Tree Beginner % 1 551 Reverse a linked list using stack Medium % 0 548 Minimum Number of Halls Required for Lecture Scheduling Hard % 1 547 Maximum Contiguous ones after one deletion Medium % 1 537 Departure and Destination Cities in a given itinerary Beginner % 2 534 Convert to Non-decreasing Array with one change Beginner % 1 529 Duplicate even elements in an array Beginner % 1 528 Minimum Increments to make all array elements unique Medium % 0 523 Add digits until the number becomes a single digit Beginner % 0 522 Check If Student is eligible for an Attendance Reward Beginner % 0 520 Remove Duplicates in a given Sorted Array Beginner % 0 518 Replace Elements with Greatest Element on Right Beginner % 0 517 Count number of pairs in an array with sum = K Medium % 0 515 Maximum distance from the nearest person Medium % 1 509 Find the Number of Contiguous Parking Areas Medium % 1 503 Minimum Deletions to make the occurrence of each character unique. Hard % 1 499 Compare two version numbers of a software Medium % 1 493 Maximum meetings in one room Medium % 0 Find an extra element in two almost similar arrays find the Arithmetic Progression sequence Find the Nth-term in a given arithmetic progression Given an array, rank its elements Find the number of pairs with odd XOR Count similar words in a given array Colorful Numbers Find Three Consecutive Odd Numbers in an array Convert a Decimal number to its binary representation Maximum Consecutive Ones in a given array In a number, add digits until it becomes a single digit Minimum number of times String A is repeated to such that B is substring of A Dynamic Programming - Minimum Cost for Climbing Stairs Maximizing Contiguous Ones with a Single Flip in a Binary Array Sort 0, 1, 2 in an array - Part 1 Breadth-First Search/Traversal in a Binary Tree All Permutations of a String Find the Maximum Depth OR Height of a Binary Tree Reverse a linked list using stack Minimum Number of Halls Required for Lecture Scheduling Maximum Contiguous ones after one deletion Departure and Destination Cities in a given itinerary Convert to Non-decreasing Array with one change Duplicate even elements in an array Minimum Increments to make all array elements unique Add digits until the number becomes a single digit Check If Student is eligible for an Attendance Reward Remove Duplicates in a given Sorted Array Replace Elements with Greatest Element on Right Count number of pairs in an array with sum = K Maximum distance from the nearest person Find the Number of Contiguous Parking Areas Minimum Deletions to make the occurrence of each character unique. Compare two version numbers of a software Maximum meetings in one room 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16