LeetCode Increasing Triplet Subsequence(动态规划)

问题：问数组中是否存在一个上升的三元子序列

思路：方法一是使用动态规划求解上升子序列，如果子序列长度等于3，说明存在

方法二是使用small,mid分别记录最小值，第二小值，如果当前值比small小则更新最小值，重新一轮。比第二小值小，则更新mid,在此轮上可以继续。如果当前值大小mid,说明已经找到了满足条件的

方法三是使用left[i],right[i]记录i左边、右边的最小值，最大值。如果left[i] < nums[i]< right[i]说明满足条件

具体代码参考：

https://github.com/wuli2496/OJ/tree/master/LeetCode/Increasing%20Triplet%20Subsequence

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