Topic: stack-problem / Level: beginner

• 51. Write a function to reverse an array using a stack.
• 52. Implement a stack that keeps track of the sum of its elements at each push operation.
• 53. Create a function to push all prime numbers from an array into a stack.
• 54. Write a program to remove all elements greater than a given value from a stack.
• 55. Implement a stack that supports undo and redo operations.
• 56. Write a function to find the maximum depth of a stack.
• 57. Create a function to push all elements smaller than a specified value into a stack.
• 58. Write a program to reverse a queue using a stack.
• 59. Implement a stack that supports push, pop, and getting the average of elements in constant time.
• 60. Write a function to delete all negative numbers from a stack.
• 61. Create a function to push elements from two arrays into two separate stacks.
• 62. Write a program to push elements into a stack and pop elements based on priority (min/max).
• 63. Implement a stack that supports push, pop, and getting the second minimum element.
• 64. Write a program to check if two stacks are equal.
• 65. Create a function to push elements from a matrix into a stack, row by row.
• 66. Write a function to count the occurrences of a given element in a stack.
• 67. Implement a function to push elements from an array into a stack in reverse order.
• 68. Write a program to push characters from a string into a stack and print them in reverse order.
• 69. Create a stack that allows pushing elements only if they are even.
• 70. Write a program to push elements into a stack and pop elements only if they are greater than a specified threshold.
• 71. Implement a function to pop elements from a stack until a prime number is encountered.
• 72. Write a function to reverse a list of integers using a stack.
• 73. Create a function to remove all duplicate elements from a stack.
• 74. Write a program to push the elements of a linked list into a stack and print them in reverse order.
• 75. Implement a function to rotate a stack k times to the left.
• 76. Write a program to push elements from a queue into a stack and print the stack.
• 77. Create a function to push numbers into a stack and remove numbers greater than a specific value.
• 78. Write a program to push the digits of a number into a stack and reverse the number using the stack.
• 79. Implement a function to push elements from one stack into another stack in reverse order.
• 80. Write a function to count the total number of elements in two stacks.
• 81. Create a program to push all elements from an array into a stack and find the sum of the elements.
• 82. Write a program to check if a stack contains any palindrome elements.
• 83. Implement a function to push elements from two stacks into a third stack in sorted order.
• 84. Write a function to check if the elements of two stacks are the same, regardless of order.
• 85. Create a function to find the maximum element in two stacks combined.
• 86. Write a program to push elements into a stack and remove elements smaller than a specified value.
• 87. Implement a function to delete the top k elements from a stack.
• 88. Write a program to print the elements of a stack without modifying the stack.
• 89. Create a function to push elements into a stack and pop elements only if they are odd.
• 90. Write a program to push the elements of a trees preorder traversal into a stack.
• 91. Implement a function to convert a postfix expression to an infix expression using a stack.
• 92. Write a program to push all digits of a number into a stack and print them in reverse order.
• 93. Create a function to push the elements of a graphs DFS traversal into a stack.
• 94. Write a program to push the elements of an array into a stack and print the minimum and maximum values.
• 95. Implement a function to reverse the order of words in a string using a stack.
• 96. Write a program to push all vowels from a string into a stack.
• 97. Create a function to pop elements from a stack and return the smallest element.
• 98. Write a program to check if the elements of a stack form an arithmetic sequence.
• 99. Implement a function to push characters into a stack and pop them in reverse order.
• 100. Write a program to push all elements from two arrays into a stack and remove duplicate elements.

• More Levels

• Intermediate
• Advanced