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include include include include include include include include include include include include include using namespace std; struct node{ string id, n 阅读全文
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题意 给出一个区间的集合，请合并所有重叠的区间。 示例 输入: [[1,3],[2,6],[8,10],[15,18]] 输出: [[1,6],[8,10],[15,18]] 解释: 区间 [1,3] 和 [2,6] 重叠, 将它们合并为 [1,6]. 思路 贪心，按照每个区间的开始值，从小到大排序 阅读全文
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Programming Ability Test (PAT) is organized by the College of Computer Science and Technology of Zhejiang University. Each test is supposed to run sim 阅读全文
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A number that will be the same when it is written forwards or backwards is known as a Palindromic Number . For example, 1234321 is a palindromic numbe 阅读全文
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A graph which is connected and acyclic can be considered a tree. The height of the tree depends on the selected root. Now you are supposed to find the 阅读全文
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Notice that the number 123456789 is a 9 digit number consisting exactly the numbers from 1 to 9, with no duplication. Double it we will obtain 2469135 阅读全文
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Suppose that all the keys in a binary tree are distinct positive integers. Given the postorder and inorder traversal sequences, you are supposed to ou 阅读全文
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The task is simple: given any positive integer N , you are supposed to count the total number of 1's in the decimal form of the integers from 1 to N . 阅读全文
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题意 There is a public bike service in Hangzhou City which provides great convenience to the tourists from all over the world. One may rent a bike at an 阅读全文
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思路 用一个数组记录乘积的结果，最后处理进位。 代码 阅读全文