Ascending/Descending Stack/ Queue

(1) Binary Tree in-order traversal using iterative way (See Tree)
(2) Max Tree (lintcode pay questions)
(3) Largest Rectangle in Histogram (leetcode 84)
(4) Sliding window maximum (leetcode 239)
(5) Expression Tree Build (lintcode 367)
(6) Expression evaluation (lintcode 368) Similar: Basic Calculator (leetcode 224) Basic Calculator II (leetcode 227)
(7) Convert Expression to Reverse Polish Notation (lintcode 370) similar: evaluate Reverse Polish Notation (leetcode 150)
(8) Expression add operators (leetcode 282)