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Given a string s and a non-empty string p, find all the start indices of p's anagrams in s. Strings consists of lowercase English letters only and the 阅读全文
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An image is represented by a 2-D array of integers, each integer representing the pixel value of the image (from 0 to 65535). Given a coordinate (sr, 阅读全文
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X is a good number if after rotating each digit individually by 180 degrees, we get a valid number that is different from X. Each digit must be rotate 阅读全文
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Given a string S, we can transform every letter individually to be lowercase or uppercase to create another string. Return a list of all possible stri 阅读全文
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You're given strings J representing the types of stones that are jewels, and S representing the stones you have. Each character in Sis a type of stone 阅读全文
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A matrix is Toeplitz if every diagonal from top-left to bottom-right has the same element. Now given an M x N matrix, return True if and only if the m 阅读全文
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内连接(INNER JOIN)： 分为三种 等值连接、自然连接、不等连接 外连接(OUTER JOIN)： 左外连接(LEFT OUTER JOIN或LEFT JOIN) 右外连接(RIGHT OUTER JOIN或RIGHT JOIN) 全外连接(FULL OUTER JOIN或FULL JOIN 阅读全文
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Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements that appear twi 阅读全文
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Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id. For example, aft 阅读全文
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Given a Weather table, write a SQL query to find all dates' Ids with higher temperature compared to its previous (yesterday's) dates. For example, ret 阅读全文