Update stack.md (#58)

* Update stack.md * Update stack.md
7 years ago · 5d9002d786
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@ -6,3 +6,4 @@ Stack
 - Write an algorithm to determine if all of the delimiters in an expression are matched and closed.
  - E.g. `{ac[bb]}`, `[dklf(df(kl))d]{}` and `{[[[]]]}` are matched. But `{3234[fd` and `{df][d}` are not.
  - [Source](http://blog.gainlo.co/index.php/2016/09/30/uber-interview-question-delimiter-matching/)
+- Sort a stack in ascending order using an additional stack.