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### 问题1
给定一个整型数组arr，代表数值不同的纸牌排成一条线，玩家A和玩家B依次拿走每张纸牌，规定玩家A先拿，玩家B后拿，但是每个玩家每次只能拿走最左边或者最右边的纸牌，玩家A和玩家B都绝顶聪明，请返回最后获胜者的分数。[50,100,20,10]