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A Binary Search Tree (BST) is recursively defined as a binary tree which has the following properties: The left subtree of a node contains only nodes 阅读全文
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1042. Shuffling Machine (20) Shuffling is a procedure used to randomize a deck of playing cards. Because standard shuffling techniques are seen as wea 阅读全文
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Being unique is so important to people on Mars that even their lottery is designed in a unique way. The rule of winning is simple: one bets on a numbe 阅读全文
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Given a string, you are supposed to output the length of the longest symmetric sub string. For example, given "Is PAT&TAP symmetric?", the longest sym 阅读全文
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Zhejiang University has 40000 students and provides 2500 courses. Now given the student name lists of all the courses, you are supposed to output the 阅读全文
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Given a collection of number segments, you are supposed to recover the smallest number from them. For example, given {32, 321, 3214, 0229, 87}, we can 阅读全文
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The magic shop in Mars is offering some magic coupons. Each coupon has an integer N printed on it, meaning that when you use this coupon with a produc 阅读全文
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This time you are asked to tell the difference between the lowest grade of all the male students and the highest grade of all the female students. Inp 阅读全文
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To prepare for PAT, the judge sometimes has to generate random passwords for the users. The problem is that there are always some confusing passwords 阅读全文
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1034. Head of a Gang (30） One way that the police finds the head of a gang is to check people's phone calls. If there is a phone call between A and B, 阅读全文