VietMX Staff asked 3 years ago
They’re very useful because they afford you constant time O(1) operations when inserting or removing from the front of a data structure. One common use of a stack is in compilers, where a stack can be used to make sure that the brackets and parentheses in a code file are all balanced, i.e., have an opening and closing counterpart. Stacks are also very useful in evaluating mathematical expressions.
