It is important that credit card companies are able to recognize fraudulent credit card transactions so that customers are not charged for items that they did not purchase. This dataset presents transactions that occurred in two days, where we have 492 frauds out of 284,807 transactions. The dataset is highly unbalanced.

It is important that credit card companies are able to recognize fraudulent credit card transactions so that customers are not charged for items that they did not purchase. This dataset presents transactions that occurred in two days, where we have 492 frauds out of 284,807 transactions. The dataset is highly unbalanced.

题目大意，给定一个数学表达式，在表达式的不同地方添加括号来表示不同的运算顺序，求最后有多少种不同的运算结果

题目大意，给定一个无序的数列，求这个序列的最长单调增的子序列的长度。

这是一道easy的题目，但是有很多变种

题目大意，给定一个二维矩阵，再给定左上角和右下角的坐标，求坐标围成的矩形的元素的和

题目大意：给定一个数组，第i个元素表示第i天的股票价格。每天只能最多一次买或者卖(必须有股票才能卖)。卖了以后第二天不能买(cooldown)。求最大的利润。

题目大意：给定一个字符串和一个字典，查看字符串能不能由字典里的单词构成。

题目大意：单词分割，给定一个字符串和一个字典，如果字符串能由字典里的单词组成，那么返回组成的单词。最后要求返回所有的可能的解。

题目大意：骑士在左上角(0, 0),公主在右下角(m, n)。骑士每次只能向右或者向下，每个方格表示骑士消耗获得的hp，题目要求骑士出发时候所需要的最小hp。在任何位置骑士的hp都要大于0