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 551 Reverse a linked list using stack Medium % 0 550 Debugging Techniques- How to Efficiently Find and Fix Software Bugs Medium % 1 549 Dynamic Programming - Minimum Cost for Climbing Stairs Medium % 0 548 Minimum Number of Halls Required for Lecture Scheduling Hard % 1 547 Maximum Contiguous ones after one deletion Medium % 2 546 Converting to Non-Decreasing Array with One Change Medium % 0 545 Maximizing Contiguous Ones with a Single Flip in a Binary Array Medium % 3 544 Counting the Largest Number Groups by Digit Sum Medium % 2 543 Adding One to a Number Represented by an Array Medium % 1 541 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 % 1 538 Find The Minimum time difference Medium % 1 537 Departure and Destination Cities in a given itinerary Beginner % 2 536 Efficiently Rank Elements in a Given Array Beginner % 3 535 Find Three Consecutive Odd Numbers in an array Beginner % 2 534 Convert to Non-decreasing Array with one change Beginner % 1 533 In an array, Duplicate the zeroes without expanding it Beginner % 0 532 Maximum Depth of Valid Nested Parentheses in an arithmetic expression Medium % 0 531 Convert a Decimal number to its binary representation Beginner % 1 530 Find Maximum Consecutive Ones in an Array Beginner % 0 529 Duplicate even elements in an array Beginner % 1 528 Minimum Increments to make all array elements unique Medium % 0 527 In a number, add digits until it becomes a single digit Beginner % 1 526 Maximum Surpasser in the given array Hard % 0 525 Find the number of pairs with odd XOR Beginner % 2 524 Maximum CPU Load Problem in a jobs list Medium % 1 522 Check If Student is eligible for an Attendance Reward Beginner % 0 521 Maximum overlaps in a given list of time intervals Medium % 0 520 Remove Duplicates in a given Sorted Array Beginner % 0 519 Random character in a given string - Java Beginner % 0 518 Replace Elements with Greatest Element on Right Beginner % 0 517 Count number of pairs in an array with sum = K Medium % 0 516 Count similar words in a given array Beginner % 1 515 Maximum distance from the nearest person Medium % 1 Reverse a linked list using stack Debugging Techniques- How to Efficiently Find and Fix Software Bugs Dynamic Programming - Minimum Cost for Climbing Stairs Minimum Number of Halls Required for Lecture Scheduling Maximum Contiguous ones after one deletion Converting to Non-Decreasing Array with One Change Maximizing Contiguous Ones with a Single Flip in a Binary Array Counting the Largest Number Groups by Digit Sum Adding One to a Number Represented by an Array Find an extra element in two almost similar arrays find the Arithmetic Progression sequence Find the Nth-term in a given arithmetic progression Find The Minimum time difference Departure and Destination Cities in a given itinerary Efficiently Rank Elements in a Given Array Find Three Consecutive Odd Numbers in an array Convert to Non-decreasing Array with one change In an array, Duplicate the zeroes without expanding it Maximum Depth of Valid Nested Parentheses in an arithmetic expression Convert a Decimal number to its binary representation Find Maximum Consecutive Ones in an Array Duplicate even elements in an array Minimum Increments to make all array elements unique In a number, add digits until it becomes a single digit Maximum Surpasser in the given array Find the number of pairs with odd XOR Maximum CPU Load Problem in a jobs list Check If Student is eligible for an Attendance Reward Maximum overlaps in a given list of time intervals Remove Duplicates in a given Sorted Array Random character in a given string - Java Replace Elements with Greatest Element on Right Count number of pairs in an array with sum = K Count similar words in a given array Maximum distance from the nearest person 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16