Array problems

247 Array DSA practice problems on CampusCode, each with statement, examples and constraints.

• 1. Print Array Elements Easy Array
• 2. Find Maximum Element in Array Easy Array
• 3. Reverse an Array Easy Array
• 4. Check if Array is Sorted Easy Array
• 5. Remove Duplicates from Sorted Array Easy Array
• 6. Find the Missing Number Easy Array
• 7. Move Zeros to End Easy Array
• 8. Rotate Array by K Steps Easy Array
• 9. Find Second Largest Element Easy Array
• 10. Merge Two Sorted Arrays Easy Array
• 11. Count Even and Odd Numbers Easy Array
• 12. Intersection of Two Arrays Easy Array
• 13. Find All Duplicates in Array Easy Array
• 14. Find Minimum in Array Easy Array
• 15. Single Number (XOR Trick) Easy Array
• 16. Plus One Easy Array
• 17. Pascal's Triangle Row Easy Array
• 18. Contains Duplicate Easy Array
• 19. Best Time to Buy and Sell Stock Easy Array
• 20. Find the Pivot Index Easy Array
• 21. How Many Numbers Are Smaller Than Current Easy Array
• 22. Shuffle the Array Easy Array
• 23. Running Sum of 1D Array Easy Array
• 24. Find Numbers with Even Number of Digits Easy Array
• 25. Squares of a Sorted Array Easy Array
• 26. Check if N and Its Double Exist Easy Array
• 27. Third Maximum Number Easy Array
• 28. Find All Numbers Disappeared in Array Easy Array
• 29. Height Checker Easy Array
• 30. Sum of All Odd Length Subarrays Easy Array
• 31. Kids With the Greatest Number of Candies Easy Array
• 32. Decompress Run-Length Encoded List Easy Array
• 33. Replace Elements with Greatest Element on Right Easy Array
• 34. Maximum Product of Two Elements in an Array Easy Array
• 35. Concatenation of Array Easy Array
• 36. Build Array from Permutation Easy Array
• 37. Richest Customer Wealth Easy Array
• 38. Find the Highest Altitude Easy Array
• 39. Count Items Matching a Rule Easy Array
• 40. Find Center of Star Graph Easy Array
• 41. Flipping an Image Easy Array
• 42. Transpose Matrix Easy Array
• 43. Toeplitz Matrix Easy Array
• 44. Find Common Elements Between Two Arrays Easy Array
• 45. Count Good Pairs Easy Array
• 46. Number of Rectangles That Can Form Largest Square Easy Array
• 47. Average Salary Excluding Min and Max Easy Array
• 48. Find Smallest Letter Greater Than Target Easy Array
• 49. Matrix Diagonal Sum Easy Array
• 50. Sort Array by Parity Easy Array
• 51. Minimum Value to Get Positive Step by Step Sum Easy Array
• 52. Maximum Average Subarray I Easy Array
• 53. Largest Number At Least Twice of Others Easy Array
• 54. Max Consecutive Ones Easy Array
• 55. Left and Right Sum Differences Easy Array
• 56. Find Target Indices After Sorting Array Easy Array
• 57. Sum of Absolute Differences in Sorted Array Easy Array
• 58. Lucky Number in a Matrix Easy Array
• 59. Find the Array Concatenation Value Easy Array
• 60. Minimum Difference Between Highest and Lowest of K Scores Easy Array
• 61. Two Sum Easy Array
• 62. Three Sum Medium Array
• 63. Product of Array Except Self Medium Array
• 64. Subarray Sum Equals K Medium Array
• 65. Longest Subarray with Sum K Medium Array
• 66. Rotate Image (90 Degrees) Medium Array
• 67. Spiral Matrix Traversal Medium Array
• 68. Jump Game Medium Array
• 69. Container With Most Water Medium Array
• 70. Merge Intervals Medium Array
• 71. Insert Interval Medium Array
• 72. Sort Colors (Dutch National Flag) Medium Array
• 73. Find the Duplicate Number Medium Array
• 74. Maximum Subarray (Kadane's Algorithm) Medium Array
• 75. Longest Consecutive Sequence Medium Array
• 76. Set Matrix Zeroes Medium Array
• 77. Search in Rotated Sorted Array Medium Array
• 78. Find Peak Element Medium Array
• 79. Two Sum II - Input Array Is Sorted Medium Array
• 80. Minimum Size Subarray Sum Medium Array
• 81. Maximum Product Subarray Medium Array
• 82. Increasing Triplet Subsequence Medium Array
• 83. Next Permutation Medium Array
• 84. Partition Array into Disjoint Intervals Medium Array
• 85. Minimum Number of Arrows to Burst Balloons Medium Array
• 86. Subsets Medium Array
• 87. Permutations Medium Array
• 88. Combination Sum Medium Array
• 89. Find First and Last Position of Element in Sorted Array Medium Array
• 90. Game of Life Medium Array
• 91. Summary Ranges Medium Array
• 92. 3Sum Closest Medium Array
• 93. 4Sum Medium Array
• 94. Maximum Points You Can Obtain from Cards Medium Array
• 95. Minimum Difference Between Largest and Smallest in Three Moves Medium Array
• 96. Max Number of K-Sum Pairs Medium Array
• 97. Count Number of Nice Subarrays Medium Array
• 98. Longest Mountain in Array Medium Array
• 99. Minimum Operations to Reduce X to Zero Medium Array
• 100. Maximum Width Ramp Medium Array
• 101. Find the Duplicate Number (Floyd's Cycle Detection) Medium Array
• 102. Array Nesting Medium Array
• 103. Shortest Unsorted Continuous Subarray Medium Array
• 104. Wiggle Sort II Medium Array
• 105. Trapping Rain Water Medium Array
• 106. Subarray Product Less Than K Medium Array
• 107. Minimum Path Sum Medium Array
• 108. Jump Game II Medium Array
• 109. Largest Rectangle in Histogram Medium Array
• 110. Median of Two Sorted Arrays Hard Array
• 111. First Missing Positive Hard Array
• 112. Best Time to Buy and Sell Stock III Hard Array
• 113. Sliding Window Maximum Hard Array
• 114. Candy Hard Array
• 115. Count of Smaller Numbers After Self Hard Array
• 116. Reverse Pairs Hard Array
• 117. Maximum Sum of 3 Non-Overlapping Subarrays Hard Array
• 118. Burst Balloons Hard Array
• 119. Best Time to Buy and Sell Stock IV Hard Array
• 120. Count of Range Sum Hard Array
• 121. Maximum Gap Hard Array
• 122. Shortest Subarray with Sum at Least K Hard Array
• 123. Count Inversions in Array Hard Array
• 124. Remove Boxes Hard Array
• 125. Candy Distribution Hard Array
• 126. Jump Game II (Minimum Jumps) Hard Array
• 127. Minimum Number of Refueling Stops Hard Array
• 128. Minimum Interval to Include Each Query Hard Array
• 129. Max Value of Equation Hard Array
• 130. Find K-th Smallest Pair Distance Hard Array
• 131. Find Minimum in Rotated Sorted Array II Hard Array
• 132. Patching Array Hard Array
• 133. Create Maximum Number Hard Array
• 134. Split Array Largest Sum Hard Array
• 135. Allocate Books (Binary Search + Greedy) Hard Array
• 136. Aggressive Cows Hard Array
• 137. Number of Subarrays with Bounded Maximum Hard Array
• 138. Minimum Cost to Hire K Workers Hard Array
• 139. Maximum Performance of a Team Hard Array
• 140. Minimize Max Distance to Gas Station Hard Array
• 141. Swim in Rising Water Hard Array
• 142. Minimum Moves to Equal Array Elements II Hard Array
• 143. Range Sum Query 2D Hard Array
• 144. Count Rectangles with All Ones Hard Array
• 145. Maximum Rectangle in Binary Matrix Hard Array
• 146. Shortest Common Supersequence via Array DP Hard Array
• 147. Strange Printer (Array Encoding) Hard Array
• 148. K-th Largest Element in a Stream (Array Variant) Hard Array
• 149. Minimum Window Subarray with All Distinct Elements Hard Array
• 311. Convert Linked List to Array Easy Linked List
• 312. Convert Array to Linked List Easy Linked List
• 402. Largest Rectangle in Histogram (Stack) Hard Linked List
• 417. Binary Search in Sorted Array Easy Binary Search
• 418. Find Index of Target in Sorted Array Easy Binary Search
• 419. Count Occurrences of Element in Sorted Array Easy Binary Search
• 420. Find the First Occurrence of Target Easy Binary Search
• 421. Find the Last Occurrence of Target Easy Binary Search
• 422. Find Smallest Letter Greater Than Target Easy Binary Search
• 423. Check if Array is Sorted and Search Easy Binary Search
• 425. Find Floor of an Element in Sorted Array Easy Binary Search
• 426. Find Ceil of an Element in Sorted Array Easy Binary Search
• 427. Search Insert Position Easy Binary Search
• 429. Binary Search on Answer — Minimum Pages Easy Binary Search
• 430. Find Fixed Point (arr[i] == i) in Sorted Array Easy Binary Search
• 431. Count Negative Numbers in Sorted Matrix Easy Binary Search
• 432. Find the Only Repeating Element Easy Binary Search
• 433. Find the Only Missing Element in Sorted Array Easy Binary Search
• 434. Check if Target Exists in Sorted 2D Matrix Easy Binary Search
• 435. Find the Pivot in Rotated Sorted Array Easy Binary Search
• 436. Find Minimum in Rotated Sorted Array Easy Binary Search
• 437. Peak Index in a Mountain Array Easy Binary Search
• 438. Find in Mountain Array (Bitonic Search) Easy Binary Search
• 439. Lower Bound in Sorted Array Easy Binary Search
• 440. Upper Bound in Sorted Array Easy Binary Search
• 441. Number of Times Array is Rotated Easy Binary Search
• 442. Search in Sorted Rotated Array (No Duplicates) Easy Binary Search
• 443. Find Kth Missing Positive Number Easy Binary Search
• 445. Find Smallest Common Element in All Rows Easy Binary Search
• 446. Find N/3 Majority Element Using Binary Search Easy Binary Search
• 447. Count Elements Less Than or Equal to Mid Easy Binary Search
• 448. Find Position of Element in Infinite Sorted Array Easy Binary Search
• 450. Intersection of Two Sorted Arrays (BS Approach) Easy Binary Search
• 451. Find Pair with Given Sum in Sorted Array Easy Binary Search
• 452. Find Closest Element to Target in Sorted Array Easy Binary Search
• 453. Two Sum in Sorted Array (Binary Search Variant) Easy Binary Search
• 454. Count Pairs Whose Sum is Less Than Target Easy Binary Search
• 455. Find the Difference in Sorted Array of Consecutive Numbers Easy Binary Search
• 458. Find Kth Positive Number Not in Array Easy Binary Search
• 460. Find the Element That Appears Once in Sorted Array Easy Binary Search
• 461. Count Zeros in Sorted Binary Array Easy Binary Search
• 462. Find All Positions of Target in Sorted Array Easy Binary Search
• 463. Minimum Absolute Difference to Target in Sorted Array Easy Binary Search
• 464. Count Pairs with Difference Less Than K Easy Binary Search
• 465. Index of First 1 in Infinite Binary Sorted Array Easy Binary Search
• 466. Find Row with Maximum Ones in Sorted Binary Matrix Easy Binary Search
• 467. Find the Transition Point in 0s and 1s Array Easy Binary Search
• 468. Check if Array Can Be Made Strictly Increasing by Removing One Element Easy Binary Search
• 469. Find Smallest Missing Positive in Sorted Array Easy Binary Search
• 472. Find Maximum of Bitonic Sequence Easy Binary Search
• 473. Find Minimum Difference Between Any Two Elements Easy Binary Search
• 474. Search a 2D Matrix II (Row & Column Sorted) Easy Binary Search
• 475. Magnetic Force Between Two Balls (Introduction) Easy Binary Search
• 476. Find K Closest Elements to a Target Easy Binary Search
• 477. Find Peak Element in Array Medium Binary Search
• 478. Search in Rotated Sorted Array (With Duplicates) Medium Binary Search
• 479. Find Minimum in Rotated Sorted Array II (Duplicates) Medium Binary Search
• 480. Find K Closest Elements in Sorted Array Medium Binary Search
• 481. Capacity to Ship Packages Within D Days Medium Binary Search
• 482. Koko Eating Bananas Medium Binary Search
• 483. Minimum Number of Days to Make M Bouquets Medium Binary Search
• 484. Find the Smallest Divisor Given a Threshold Medium Binary Search
• 486. Allocate Books (Minimize Maximum Pages) Medium Binary Search
• 487. Split Array Largest Sum Medium Binary Search
• 489. Gas Station — Minimum Stations to Add Medium Binary Search
• 490. Minimize Maximum Distance to Gas Station (Scaled) Medium Binary Search
• 491. Painter's Partition Problem Medium Binary Search
• 493. Kth Element of Two Sorted Arrays Medium Binary Search
• 496. Minimum Time to Complete Trips Medium Binary Search
• 497. Minimum Speed to Arrive on Time Medium Binary Search
• 498. Maximum Candies Allocated to K Children Medium Binary Search
• 500. Count of Pairs with Sum in a Range Medium Binary Search
• 501. Find the Duplicate Number (Binary Search on Value) Medium Binary Search
• 502. H-Index II (Binary Search) Medium Binary Search
• 510. Sum of Mutated Array Closest to Target Medium Binary Search
• 511. Check If a Number Is a Majority Element in a Sorted Array Medium Binary Search
• 514. Find the Distance Value Between Two Arrays Medium Binary Search
• 519. Minimum Operations to Reduce X to Zero Medium Binary Search
• 522. Minimum Eating Speed for All Piles Medium Binary Search
• 525. Find First and Last Position of Element Medium Binary Search
• 526. Median of Two Sorted Arrays Hard Binary Search
• 530. Find in Mountain Array Hard Binary Search
• 538. Minimize Max Distance Between Gas Stations (Exact) Hard Binary Search
• 546. Allocate Minimum Number of Pages (Multi-Constraint) Hard Binary Search
• 547. Koko Eating Bananas — Generalized K Piles Hard Binary Search
• 549. Special Array With X Elements Greater Than or Equal to X Hard Binary Search
• 552. Check if There is a Valid Partition for the Array Hard Binary Search
• 554. Minimum Limit of Balls in a Bag Hard Binary Search
• 624. Maximum of Minimum for Every Window Size Medium Stack
• 666. Shortest Unsorted Continuous Subarray Hard Stack
• 680. Sum of Subarray Ranges Hard Stack
• 681. Steps to Make Array Non-decreasing Hard Stack
• 1284. Find the Only Non-Repeating Element (XOR) Easy Bit Manipulation
• 1305. Single Number I — One Element Appears Once Easy Bit Manipulation
• 1306. Missing Number in Array (XOR Approach) Easy Bit Manipulation
• 1307. Find the Two Non-Repeating Elements Easy Bit Manipulation
• 1310. Check if XOR of Array is Zero Easy Bit Manipulation
• 1338. Decode XOR Encoded Array Medium Bit Manipulation