心情不好的时候，可能这时候真的已经很疲惫了。 不要继续沮丧让自己的心情更糟糕，或许这个时候应该犒劳一下自己，让自己的心情放松，晴朗起来或许一切看起来回事那么情切舒服！
HouseRobberIII
The thief has found himself a new place for his thievery again. There is only one entrance to this area, called the “root.” Besides the root, each house has one and only one parent house. After a tour, the smart thief realized that “all houses in ...
Target Sum
You are given a list of non-negative integers, a1, a2, …, an, and a target, S. Now you have 2 symbols + and -. For each integer, you should choose one from + and - as its new symbol. Find out how many ways to assign symbols to make sum of integer...
QueueReconstructionbyHeight
Suppose you have a random list of people standing in a queue. Each person is described by a pair of integers (h, k), where h is the height of the person and k is the number of people in front of this person who have a height greater than or equal...
Dp经典问题LongestIncreasingSubsequence
Given an unsorted array of integers, find the length of longest increasing subsequence. For example, Given [10, 9, 2, 5, 3, 7, 101, 18], The longest increasing subsequence is [2, 3, 7, 101], therefore the length is 4. Note that there may be more...