Stack
20. Valid Parentheses71. Simplify Path84. Largest Rectangle in Histogram150. Evaluate Reverse Polish Notation224. Basic Calculator227. Basic Calculator II456. 132 Pattern496. Next Greater Element I503. Next Greater Element II636. Exclusive Time of Functions726. Number of Atoms735. Asteroid Collision1130. Minimum Cost Tree From Leaf Values1190. Reverse Substrings Between Each Pair of Parentheses
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