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There are a total of n courses you have to take, labeled from 0 to n-1. Some courses may have prerequisites, for example to take course 0 you have to 阅读全文
posted @ 2019-11-19 13:10
Schwifty
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Remove all elements from a linked list of integers that have value val. Example: Input: 1->2->6->3->4->5->6, val = 6 Output: 1->2->3->4->5 class Solut 阅读全文
posted @ 2019-11-19 04:13
Schwifty
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Suppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all customers who never order anything 阅读全文
posted @ 2019-11-19 03:13
Schwifty
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Write a SQL query to find all duplicate emails in a table named Person. + + + | Id | Email | + + + | 1 | a@b.com | | 2 | c@d.com | | 3 | a@b.com | + + 阅读全文
posted @ 2019-11-19 03:05
Schwifty
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The Employee table holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id. + + + + + | 阅读全文
posted @ 2019-11-19 03:00
Schwifty
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Given a binary tree with the following rules: root.val == 0 If treeNode.val == x and treeNode.left != null, then treeNode.left.val == 2 * x + 1 If tre 阅读全文
posted @ 2019-11-19 02:40
Schwifty
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Given a 2D grid of size n * m and an integer k. You need to shift the grid k times. In one shift operation: Element at grid[i][j] becomes at grid[i][j 阅读全文
posted @ 2019-11-19 00:08
Schwifty
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