ID NAME QUALITY USERS ACC % DIFFICULTY C I
4 Transform the Expression   99 23710
11
11
30831 Easy Stack   155
95 Street Parade   150 9296
13
11

#stack

Stack (LIFO - last in, first out) is an abstract data type that serves as a collection of elements, with two principal operations: push and pop

https://en.wikipedia.org/wiki/Stack_(abstract_data_type) https://en.wikibooks.org/wiki/Data_Structures/Stacks_and_Queues https://www.youtube.com/watch?v=FNZ5o9S9prU - video lecture https://www.cs.cmu.edu/~adamchik/15-121/lectures/Stacks%20and%20Queues/Stacks%20and%20Queues.html