18. The sum of the number four: consider the sum of n and a number reduced to plus and the n-1 number of issues, in descending order, the minimum is two and the number of questions, two and the number of problems easier to solve. Through new target = target - nums [i] parameter modification nsum call again () method that is recursive.
234. palindromic list: speed pointers, pointer with slow traverse res digital storage inverted, when come to the tail pointer is fast, and the determination value res.val slow.val are equal.
6.2 Notes
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