1. Water Jug Problem using Memoization
  2. Count number of triplets with product equal to given number with duplicates allowed
  3. Number of ways to divide a given number as a set of integers in decreasing order
  4. Generating subarrays using recursion
  5. Generating all possible Subsequences using Recursion
  6. Why does sizeof(x++) not increment x in C?
  7. Address Calculation Sort using Hashing
  8. Check if the given 2-D points form T-shape or not
  9. Johnson’s algorithm for All-pairs shortest paths | Implementation
  10. 2-3 Trees | (Search and Insert)
  11. Is sizeof for a struct equal to the sum of sizeof of each member?
  12. Find if an undirected graph contains an independent set of a given size
  13. Minimum difference between the highest and the smallest value of mines distributed
  14. Printing all subsets of {1,2,3,...n} without using array or loop
  15. Clone a stack without extra space
  16. Nested List Comprehensions in Python
  17. Number of Walks from source to destination
  18. Comprehensions in Python
  19. Find maximum distance between any city and station
  20. Iterate over a dictionary in Python
  21. Python | Create a Pandas Dataframe from a dict of equal length lists
  22. Maximum even length sub-string that is permutation of a palindrome
  23. How to rename columns in Pandas DataFrame
  24. Python | Sort list of dates given as strings
  25. Longest Ordered Subsequence of Vowels
  26. Sub-strings of a string that are prefix of the same string
  27. Python program to print the substrings that are prefix of the given string
  28. CSS | transition-property Property
  29. CSS | Pseudo-classes
  30. Print first n distinct permutations of string using itertools in Python
  31. Python | Implementing 3D Vectors using dunder methods
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  1. Find the smallest window in a string containing all characters of another string
  2. Check whether a given string is an interleaving of two other given strings
  3. Given a sequence of words, print all anagrams together | Set 1
  4. Check whether a given graph is Bipartite or not
  5. Expression Evaluation
  6. Find the element before which all the elements are smaller than it, and after which all are greater
  7. Convert a Binary Tree to Threaded binary tree | Set 1 (Using Queue)
  8. Longest Even Length Substring such that Sum of First and Second Half is same
  9. Group multiple occurrence of array elements ordered by first occurrence
  10. Find sum of all elements in a matrix except the elements in row and/or column of given cell?
  11. Find all possible outcomes of a given expression
  12. Combinatorial Game Theory | Set 3 (Grundy Numbers/Nimbers and Mex)
  13. Number of Integral Points between Two Points
  14. Fifth root of a number
  15. Find subarray with given sum | Set 2 (Handles Negative Numbers)
  16. Maximum product of a triplet (subsequnece of size 3) in array
  17. Maximum profit by buying and selling a share at most k times
  18. Pair with given product | Set 1 (Find if any pair exists)
  19. Minimax Algorithm in Game Theory | Set 2 (Introduction to Evaluation Function)
  20. Rearrange a string so that all same characters become atleast d distance away
  21. Longest Common Prefix using Divide and Conquer Algorithm
  22. Rearrange positive and negative numbers with constant extra space
  23. Maximize arr[j] - arr[i] + arr[l] - arr[k], such that i < j < k < l
  24. Minimax Algorithm in Game Theory | Set 4 (Alpha-Beta Pruning)
  25. Find if an expression has duplicate parenthesis or not
  26. Minimum characters to be added at front to make string palindrome
  27. Sieve of Eratosthenes in 0(n) time complexity
  28. Find elements which are present in first array and not in second
  29. Check whether row or column swaps produce maximum size binary sub-matrix with all 1s
  30. Maximum area of triangle having different vertex colors
  31. Count trailing zero bits using lookup table
  32. Maximize sum of N X N upper left sub-matrix from given 2N X 2N matrix
  33. Sorting possible using size 3 subarray rotation
  34. Check if a doubly linked list of characters is palindrome or not
  35. Search in an array of strings where non-empty strings are sorted
  36. Character replacement after removing duplicates from a string
  37. Minimum swaps to reach permuted array with at most 2 positions left swaps allowed
  38. Count of arrays in which all adjacent elements are such that one of them divide the another
  39. Maximum sum two non-overlapping subarrays of given size
  40. TimSort
  41. Number of times the largest perfect square number can be subtracted from N
  42. Find Index of 0 to be replaced with 1 to get longest continuous sequence of 1s in a binary array | Set-2
  43. Check if a king can move a valid move or not when N nights are there in a modified chessboard
  44. Non-overlapping sum of two sets
  45. Shortest path between two nodes in array like representation of binary tree
  46. Minimum Fibonacci terms with sum equal to K
  47. Remove one bit from a binary number to get maximum value
  48. Count of Palindromic substrings in an Index range
  49. Find the Sub-array with sum closest to 0
  50. Print the string by ignoring alternate occurrences of any character
  51. Find numbers of balancing positions in string
  52. Maximum score after flipping a Binary Matrix atmost K times
  53. Reverse a Linked List according to its Size
  54. Maximum possible sum of a window in an array such that elements of same window in other array are unique
  55. Find n-th lexicographically permutation of a string | Set 2
  56. Calculate number of nodes in all subtrees | Using DFS
  57. A modified game of Nim
  58. Find the n-th number whose binary representation is a palindrome
  59. Minimum cells traversed to reach corner where every cell represents jumps
  60. Check if a grid can become row-wise and column-wise sorted after adjacent swaps
  61. Count pairs in an array such that LCM(arr[i], arr[j]) > min(arr[i],arr[j])
  62. Check if the string contains consecutive letters and each letter occurs exactly once
  63. Minimum operation to make all elements equal in array
  64. Check if there is a cycle with odd weight sum in an undirected graph
  65. Rearrangement of a number which is also divisible by it
  66. Check if given array is almost sorted (elements are at-most one position away)
  67. Maximum length subsequence with difference between adjacent elements as either 0 or 1 | Set 2
  68. Largest subarray having sum greater than k
  69. Longest Common Subsequence with at most k changes allowed
  70. Node having maximum sum of immediate children and itself in n-ary tree
  71. Replace two substrings (of a string) with each other
  72. Maximum length subsequence possible of the form R^N K^N
  73. Check if the given array can represent Level Order Traversal of Binary Search Tree
  74. Cumulative frequency of count of each element in an unsorted array
  75. Index Mapping (or Trivial Hashing) with negatives allowed
  76. Distinct permutations of the string | Set 2
  77. Smallest subarray with k distinct numbers
  78. Distributing items when a person cannot take more than two items of same type
  79. Products of ranges in an array
  80. Sorting using trivial hash function
  81. Differences between number of increasing subarrays and decreasing subarrays in k sized windows
  82. Next word that does not contain a palindrome and has characters from first k
  83. Number of GP (Geometric Progression) subsequences of size 3
  84. Sparse Table
  85. Minimum characters to be replaced to remove the given substring
  86. Minimum array element changes to make its elements 1 to N
  87. Select a Random Node from a tree with equal probability
  88. Queries for frequencies of characters in substrings
  89. Total numbers with no repeated digits in a range
  90. Remove all outgoing edges except edge with minimum weight
  91. Subtree of all nodes in a tree using DFS
  92. Area of hexagon with given diagonal length
  93. Find maximum number of elements such that their absolute difference is less than or equal to 1
  94. Sum of maximum elements of all possible sub-arrays of an array
  95. Why does sizeof(x++) not increment x in C?
  96. Sum of each element raised to (prime-1) % prime
  97. Invert actual bits of a number
  98. n-th number whose sum of digits is ten
  99. Schedule jobs so that each server gets equal load
  100. Maximum Product Subarray | Added negative product case
  101. Number of subarrays having sum exactly equal to k
  102. Hypercube Graph
  103. Number of subsets with product less than k
  104. Number of Unicolored Paths between two nodes
  105. Dynamic Disjoint Set Data Structure for large range values
  106. Fibonacci Cube Graph
  107. Euler's Four Square Identity
  108. Sum of nodes at maximum depth of a Binary Tree
  109. Leftover element after performing alternate Bitwise OR and Bitwise XOR operations on adjacent pairs
  110. First element that appears even number of times in an array
  111. Largest palindromic number by permuting digits
  112. Check if number can be displayed using seven segment led
  113. Check if it possible to partition in k subarrays with equal sum
  114. Longest Palindromic Substring using Palindromic Tree | Set 3
  115. Minimum cost to process m tasks where switching costs
  116. Number of single cycle components in an undirected graph
  117. Maximum adjacent difference in an array in its sorted form
  118. Find if k bookings possible with given arrival and departure times
  119. Lexicographically Kth smallest way to reach given coordinate from origin
  120. Check if it is possible to make the given matrix increasing matrix or not
  121. Print Longest substring without repeating characters
  122. Students with maximum average score of three subjects
  123. Given two numbers as strings, find if one is a power of other
  124. Sort the biotonic doubly linked list | Set-2
  125. Check if given Sudoku board configuration is valid or not
  126. Check if a string can be formed from another string using given constraints
  127. Check if two trees are mirror of each other using level order traversal
  128. Check if two nodes are cousins in a Binary Tree | Set-2
  129. Number of Unique BST with a given key | Dynamic Programming
  130. Count the number of intervals in which a given value lies
  131. Print all distinct integers that can be formed by K numbers from a given array of N numbers
  132. Rearrange a Linked List in Zig-Zag fashion | Set-2
  133. Make all numbers of an array equal
  134. Level order traversal with direction change after every two levels | Recursive Approach
  135. Program to print last N lines | Set-2
  136. Element which occurs consecutively in a given subarray more than or equal to K times
  137. Maximize the sum of X+Y elements by picking X and Y elements from 1st and 2nd array
  138. Print levels with odd number of nodes and even number of nodes
  139. Minimum changes needed to make a 3*3 matrix magic square
  140. Maximum bishops that can be placed on N*N chessboard
  141. Smallest divisor D of N such that gcd(D, M) is greater than 1
  142. Print all the pairs that contains the positive and negative values of an element
  143. Maximum power of jump required to reach the end of string
  144. Number of ways to represent a number as sum of k fibonacci numbers
  145. Shortest distance between two nodes in an infinite binary tree
  146. Check if is possible to get given sum from a given set of elements
  147. Longest subsequence whose average is less than K
  148. Maximum value of XOR among all triplets of an array
  149. Longest common anagram subsequence from N strings
  150. Add two unsigned numbers using bits
  151. Sum of all elements repeating 'k' times in an array
  152. Split array to three subarrays such that sum of first and third subarray is equal and maximum
  153. Tail recursion to calculate sum of array elements.
  154. Number of divisors of product of N numbers
  155. Minimize ASCII values sum after removing all occurrences of one character
  156. Product of lengths of all cycles in an undirected graph
  157. Lexicographically smallest permutation of a string with given subsequences
  158. Minimum operation require to make first and last character same
  159. Generating subarrays using recursion
  160. Longest subarray having difference in the count of 1's and 0's equal to k
  161. Minimum number of palindromes required to express N as a sum | Set 2
  162. Count numbers (smaller than or equal to N) with given digit sum
  163. Program to find the diameter, cycles and edges of a Wheel Graph
  164. Count number of integers less than or equal to N which has exactly 9 divisors
  165. Sum of minimum elements of all subarrays
  166. Length of largest sub-array having primes strictly greater than non-primes
  167. Replace even nodes of a doubly linked list with the elements of array
  168. Number of values of b such that a = b + (a^b)
  169. Replace minimal number of characters to make all characters pair wise distinct
  170. Rearrange the string to maximize the number of palindromic substrings
  171. Queries to add, remove and return the difference of maximum and minimum.
  172. Check if an integer can be expressed as a sum of two semi-primes
  173. Hammered distance between N points in a 2-D plane
  174. Maximum removal from array when removal time >= waiting time
  175. Check whether the given number is Euclid Number or not
  176. Count the number of pop operations on stack to get each element of the array
  177. Maximize the number of subarrays with XOR as zero
  178. Ulam Number Sequence
  179. Sum of every K'th prime number in an array
  180. Minimum Bitwise AND operations to make any two array elements equal
  181. Check if all sub-numbers have distinct Digit product
  182. Gould's Sequence
  183. Check if suffix and prefix of a string are palindromes
  184. Find the winner of the game with N piles of boxes
  185. Check if the given number is Ore number or not
  186. Check whether a binary string can be formed by concatenating given N numbers sequentially
  187. Maximum number of fixed points using atmost 1 swap
  188. Largest element in the array that is repeated exactly k times
  189. Check if a pair with given product exists in Linked list
  190. Numbers that are bitwise AND of at least one non-empty sub-array
  191. Sub-strings having exactly k characters that have ASCII value greater than p
  192. Check if the frequency of all the digits in a number is same
  193. Sort prime numbers of an array in descending order
  194. Number of anomalies in an array
  195. All possible numbers of N digits and base B without leading zeros
  196. Minimum number of bottles required to fill K glasses
  197. Find two non-overlapping pairs having equal sum in an Array
  198. Online Queries for GCD of array after divide operations
  199. Triplet pair (a, b, c) such that a+b, b+c and a+c are all divisible by K
  200. Find minimum speed to finish all Jobs
  201. Permutation of an array that has smaller values from another array
  202. Python | range() does not return an iterator
  203. Find length of longest Fibonacci like subsequence
  204. Check if it is possible to rearrange a binary string with alternate 0s and 1s
  205. Check if there is any pair in a given range with GCD is divisible by k
  206. Get K-th letter of the decoded string formed by repeating substrings
  207. String after processing backspace characters
  208. Shift all prefixes by given lengths
  209. Maximizing the elements with a[i+1] > a[i]
  210. Count Magic squares in a grid
  211. Rearrange an array to maximize i*arr[i]
  212. String matching with * (that matches with any) in any of the two strings
  213. Minimize Cost with Replacement with other allowed
  214. String with frequency of characters in Lucas Sequence
  215. Convert all lowercase characters to uppercase whose ASCII value is co-prime with k
  216. Replace all consonants with nearest vowels in a string
  217. XOR of all Prime numbers in an Array
  218. Number of ways to partition a string into two balanced subsequences
  219. Minimum array elements to be changed to make it a Lucas Sequence
  220. Most frequent word in first String which is not present in second String
  221. Count of Prime Nodes of a Singly Linked List
  222. Check whether frequency of characters in a string makes Fibonacci Sequence
  223. Shortest distance to every other character from given character
  224. XOR of Prime Frequencies of Characters in a String
  225. Count pairs in an array such that frequency of one is at least value of other
  226. Count occurrences of the average of array elements with a given number
  227. Number of sub-arrays that have at least one duplicate
  228. Minimum number of elements to be replaced to make the given array a Fibonacci Sequence
  229. Check if frequency of character in one string is a factor or multiple of frequency of same character in other string
  230. Count subarrays with Prime sum
  231. Find all good indices in the given Array
  232. Ways to form n/2 pairs such that difference of pairs is minimum
  233. Different possible marks for n questions and negative marking
  234. Smallest prime number missing in an array
  235. Minimum and maximum node that lies in the path connecting two nodes in a Binary Tree
  236. Find the missing elements from 1 to M in given N ranges
  237. Print all pairs in an unsorted array with equal sum
  238. Count distinct pairs from two arrays having same sum of digits
  239. Find a value whose XOR with given number is maximum
  240. Number of blocks in a chessboard a knight can move to in exactly k moves
  241. Check if the given push and pop sequences of Stack is valid or not
  242. Count pairs (A, B) such that A has X and B has Y number of set bits and A+B = C
  243. Maximum sum subarray such that start and end values are same
  244. Closest greater or same value on left side for every element in array
  245. Find if there is any subset of size K with 0 sum in an array of -1 and +1
  246. Check if N can be represented as sum of integers chosen from set {A, B}
  247. Lexicographically Smallest Permutation of length N such that for exactly K indices, a[i] > a[i] + 1
  248. Count number of indices such that s[i] = s[i+1] : Range queries
  249. Maximize the median of an array
  250. Find a range that covers all the elements of given N ranges
  251. Fill missing entries of a magic square
  252. Level Order Successor of a node in Binary Tree
  253. Check if array can be sorted with one swap
  254. Print numbers with digits 0 and 1 only such that their sum is N
  255. Number of comparisons in each direction for m queries in linear search
  256. Replace the middle element of matrix with sum of surrounding elements
  257. Number of triangles that can be formed with given N points
  258. Level with maximum number of nodes using DFS in a N-ary tree
  259. Digits of element wise sum of two arrays into a new array
  260. Construct a binary string following the given constraints
  261. Move all special char to the end of the String
  262. Find the only different element in an array
  263. Puzzle | 1000 light bulbs switched on/off by 1000 persons passing by
  264. Minimum moves required to change position with the given operation
  265. Check if elements of an array can be arranged satisfying the given condition
  266. Find the minimum positive integer such that it is divisible by A and sum of its digits is equal to B
  267. Sum of first N natural numbers when N is extremely large
  268. Maximum possible time that can be formed from four digits
  269. Largest Divisor of a Number not divisible by a perfect square
  270. Find k-th character of decrypted string | Set - 2
  271. Summing the sum series
  272. Most frequent factor in a range of integers
  273. Program to print the given H Pattern
  274. Update adjacent nodes if the current node is zero in a Singly Linked List
  275. Find numbers a and b that satisfy the given conditions
  276. Count numbers < = N whose difference with the count of primes upto them is > = K
  277. Substring Reverse Pattern
  278. Sum of element whose prime factors are present in array
  279. Minimum K such that every substring of length atleast K contains a character c
  280. Minimum Operations to make value of all vertices of the tree Zero
  281. Sum of LCM(1, n), LCM(2, n), LCM(3, n), ... , LCM(n, n)
  282. Count of Numbers in a Range divisible by m and having digit d in even positions
  283. Check if a number is perfect square without finding square root
  284. Choose n elements such that their mean is maximum
  285. Pairs with same Manhattan and Euclidean distance
  286. Assign weights to edges such that longest path in terms of weights is minimized
  287. Check whether a + b = c or not after removing all zeroes from a,b and c
  288. Represent n as the sum of exactly k powers of two | Set 2
  289. Finding in and out degrees of all vertices in a graph
  290. Count rows in a matrix that consist of same element
  291. Print all integers that are sum of powers of two given numbers
  292. Possible cuts of a number such that maximum parts are divisible by 3
  293. Weighted sum of the characters of a string in an array | Set 2
  294. Cost to make a string Panagram | Set 2
  295. Check if it is possible to get back to 12'0 clock only by adding or subtracting given seconds
  296. Check if a string can be repeated to make another string
  297. Largest number less than or equal to N/2 which is coprime to N
  298. Reverse Middle X Characters
  299. Check if the binary representation of a number has equal number of 0s and 1s in blocks
  300. Replace each node with its Surpasser Count in Linked List
  301. Finding the path from one vertex to rest using BFS
  302. Count strings that end with the given pattern
  303. Find safe cells in a matrix
  304. Find the resulting Colour Combination
  305. Water Game
  306. Remove first X rows and columns from a matrix
  307. Divide N segments into two non-empty groups such that given condition is satisfied
  308. Minimum operations of given type to make all elements of a matrix equal
  309. Maximum given sized rectangles that can be cut out of a sheet of paper
  310. Generate a random permutation of 1 to N
  311. Count all Prime Length Palindromic Substrings
  312. Increasing sequence with given GCD
  313. Check if a binary string contains consecutive same or not
  314. Cost of painting n * m grid
  315. Count Odd and Even numbers in a range from L to R
  316. Find the lexicographically largest palindromic Subsequence of a String
  317. Make palindromic string non-palindromic by rearranging its letters
  318. Minimum number of edges between two vertices of a graph using DFS
  319. Sub-string that contains all lowercase alphabets after performing the given operation
  320. Minimum operations required to modify the array such that parity of adjacent elements is different
  321. Find the cordinates of the fourth vertex of a rectangle with given 3 vertices
  322. Minimum number of operations on an array to make all elements 0
  323. Sum of minimum elements of all possible sub-arrays of an array
  324. Maximum number of segments that can contain the given points
  325. Program to reverse a linked list using Stack
  326. Count possible moves in the given direction in a grid
  327. Shortest path to traverse all the elements of a circular array in increasing order
  328. Reverse zigzag Traversal of a Binary Tree
  329. Count of words that are present in all the given sentences
  330. Sum of XOR of all subarrays
  331. Delete nodes which have a greater value on right side using recursion
  332. DP on Trees | Set-3 ( Diameter of N-ary Tree )
  333. Print the first shortest root to leaf path in a Binary Tree
  334. Search element in a Spirally sorted Matrix
  335. Merge K sorted arrays of different sizes | ( Divide and Conquer Approach )
  336. Minimum edges to be added in a directed graph so that any node can be reachable from a given node
  337. Count of numbers between range having only non-zero digits whose sum of digits is N and number is divisible by M
  338. Zig-Zag traversal of a Binary Tree using Recursion
  339. Minimum operations to make counts of remainders same in an array
  340. Print All Leaf Nodes of a Binary Tree from left to right | Set-2 ( Iterative Approach )
  341. Find the Nth term of the series where each term f[i] = f[i - 1] - f[i - 2]
  342. Number of submatrices with OR value 1
  343. Minimum possible sum of array elements after performing the given operation
  344. Number of submatrices with all 1s
  345. Bitwise AND of N binary strings
  346. Number of unique paths in tree such that every path has a value greater than K
  347. Print the lexicographically smallest DFS of the graph starting from 1
  348. Maximum length of the sub-array whose first and last elements are same
  349. Longest Sub-array with maximum average value
  350. Sum of bitwise AND of all submatrices
  351. Sum of Bitwise-OR of all Submatrices
  352. Double Knapsack | Dynamic Programming
  353. Minimum operations to make frequency of all characters equal K
  354. Count pairs (p, q) such that p occurs in array at least q times and q occurs at least p times
  355. Number of special nodes in an n-ary tree
  356. Check if frequency of characters are in Recaman Series
  357. Character pairs from two strings with even sum
  358. Number of ways to select a node from each connected component
  359. Time until distance gets equal to X between two objects moving in opposite direction
  360. Sum of numbers from 1 to N which are in Fibonacci Sequence
  361. Minimum number of replacements to make the binary string alternating | Set 2
  362. Longest double string from a Palindrome
  363. Minimum number of bracket reversals needed to make an expression balanced | Set - 2
  364. Sum of the series (1*2) + (2*3) + (3*4) + ...... upto n terms
  365. Largest subset of rectangles such that no rectangle fit in any other rectangle
  366. Sum of nodes in top view of binary tree
  367. Find the K-th minimum element from an array concatenated M times
  368. Sum of all even factors of numbers in the range [l, r]
  369. Longest path in a directed Acyclic graph | Dynamic Programming
  370. Print the balanced bracket expression using given brackets
  371. Encrypt a string by repeating i-th character i times
  372. Count of all N digit numbers such that num + Rev(num) = 10^N - 1
  373. Sum of (maximum element - minimum element) for all the subsets of an array.
  374. Find A and B from list of divisors
  375. Character whose frequency is equal to the sum of frequencies of other characters of the given string
  376. Distinct state codes that appear in a string as contiguous sub-strings
  377. Sum of nodes in bottom view of Binary Tree
  378. Check if the given string is K-periodic
  379. Check if a Queen can attack a given cell on chessboard
  380. Smallest and Largest N-digit perfect cubes
  381. Addition of two numbers without propagating Carry
  382. Number of steps required to reach point (x,y) from (0,0) using zig-zag way
  383. Minimum cuts required to convert a palindromic string to a different palindromic string
  384. Find maximum N such that the sum of square of first N natural numbers is not more than X
  385. Generate all the binary strings of N bits
  386. Position of the K-th set bit in a number
  387. Find the number of good permutations
  388. Minimum length of square to contain at least half of the given Coordinates
  389. Maximum count of pairs which generate the same sum
  390. Count integers in a range which are divisible by their euler totient value
  391. Find foot of perpendicular from a point in 2 D plane to a Line
  392. Find a pair from the given array with maximum nCr value
  393. Minimum steps to delete a string by deleting substring comprising of same characters
  394. Maximum sum from three arrays such that picking elements consecutively from same is not allowed
  395. Count of buttons pressed in a keypad mobile
  396. Correct the Random Pointer in Doubly Linked List
  397. Check if the given binary tree has a sub-tree with equal no of 1's and 0's | Set 2
  398. Program to calculate Double Integration
  399. Maximize the value of the given expression
  400. Loss when two items are sold at same price and same percentage profit/loss
  401. Total distinct pairs of ugly numbers from two arrays
  402. Sort ugly numbers in an array at their relative positions
  403. Times required by Simple interest for the Principal to become Y times itself
  404. Iterative approach to check for children sum property in a Binary Tree
  405. Generate all binary strings of length n with sub-string "01" appearing exactly twice
  406. Length of the longest substring that do not contain any palindrome
  407. Arrange given numbers to form the smallest number
  408. Maximum Subarray Sum after inverting at most two elements
  409. Find number of edges that can be broken in a tree such that Bitwise OR of resulting two trees are equal
  410. Find the longest subsequence of an array having LCM at most K
  411. Sum of two numbers where one number is represented as array of digits
  412. Number of ways for playing first move optimally in a NIM game
  413. Number of ways of choosing K equal substrings of any length for every query
  414. Area of the biggest ellipse inscribed within a rectangle
  415. Minimum number of given operations required to convert a permutation into an identity permutation
  416. Find the count of sub-strings whose characters can be rearranged to form the given word
  417. Count all prefixes of the given binary array which are divisible by x
  418. Count consecutive pairs of same elements
  419. Iterative selection sort for linked list
  420. Print path from root to all nodes in a Complete Binary Tree
  421. Convert the undirected graph into directed graph such that there is no path of length greater than 1
  422. Find triplet such that number of nodes connecting these triplets is maximum
  423. Length of the longest substring with no consecutive same letters
  424. Find number of unique triangles among given N triangles
  425. Sum of all distinct nodes in a linked list
  426. Sum of smaller elements of nodes in a linked list
  427. Divide a number into two parts
  428. Check if the given Binary Expressions are valid
  429. Number of Positions to partition the string such that atleast m characters with same frequency are present in each substring
  430. Find the kth node in vertical order traversal of a Binary Tree
  431. Maximum length cycle that can be formed by joining two nodes of a binary tree
  432. Game Theory in Balanced Ternary Numeral System | (Moving 3k steps at a time)
  433. Kth largest node among all directly connected nodes to the given node in an undirected graph
  434. Maximum sum of non-leaf nodes among all levels of the given binary tree
  435. Sum of all parent-child differences in a Binary Tree
  436. Arrange array elements such that last digit of an element is equal to first digit of the next element
  437. Find an index such that difference between product of elements before and after it is minimum
  438. Maximum Sum SubArray using Divide and Conquer | Set 2
  439. Find sub-arrays from given two arrays such that they have equal sum
  440. Count number of subsets whose median is also present in the same subset
  441. Smallest multiple of N formed using the given set of digits
  442. Minimum number of given operations required to reduce the array to 0 element
  443. K-th ancestor of a node in Binary Tree | Set 3
  444. Sum of the mirror image nodes of a complete binary tree in an inorder way
  445. Count the number of primes in the prefix sum array of the given array
  446. Maximum possible middle element of the array after deleting exactly k elements
  447. Print the degree of every node from the given Prufer sequence