Check the expression has valid or Balanced parenthesis or not.
Try YourSelfDesign a Stack that supports getMin() in O(1) time and O(1) extra space.
Try YourSelfImplement a method to insert an element at its bottom without using any other data structure.
Try YourSelfStack Permutations (Check if an array is stack permutation of other)
Try YourSelfInterleave the first half of the queue with second half
Try YourSelfFind the first circular tour that visits all Petrol Pumps
Try YourSelfDistance of nearest cell having 1 in a binary matrix
Try YourSelfFirst negative integer in every window of size “k”
Try YourSelfCheck if all levels of two trees are anagrams or not.
Try YourSelfSum of minimum and maximum elements of all subarrays of size “k”.
Try YourSelfMinimum sum of squares of character counts in a given string after removing “k” characters.
Try YourSelfQueue based approach or first non-repeating character in a stream.
Try YourSelf
CGPA BOOSTER