HBC25592判断字母Cards with Numbers题解

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AFei has many cards.Each card has a number written on it. Now he wants to takessome out of his card and puts them in a box. And he wants to know whether the card with the number x was in the box.So he has the following two operations： 0 x 1 x

AFei has many cards. Each card has a number written on it. Now he wants to takes some out of his card and puts them in a box. And he wants to know whether the card with the number x was in the box. So he has the following two operations： 0 x （It means to put a card with the number x in the box.） 1 x   (It means to query if there is a card with the number x in the box.)

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标签： HBC25592判断字母Cards with Numbers题解