30 DFS (recursion)
L528 Flatten Nested List Iterator (341)
385 Mini Parser -- 因为跟nestedinteger有关，所以放这里了，其实用了stack
430 Flatten a Multilevel Doubly Linked List
301 Remove Invalid Parentheses
394 Decode String (L575 Expression Expand)
439 Ternary Expression Parser -- 用stack比较快
472 Concatenated Word
473 Matchsticks to Square
491 Increasing Sebsequences
488 Zuma Game
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