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Given a wordlist, we want to implement a spellchecker that converts a query word into a correct word. For a given query word, the spell checker handle 阅读全文
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Shuffle a set of numbers without duplicates. Example: Runtime: 244 ms, faster than 36.91% of C++ online submissions for Shuffle an Array. 阅读全文
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Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example: Input: 2 Output: 91 Explanation: The answer shoul 阅读全文
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In a group of N people (labelled 0, 1, 2, ..., N-1), each person has different amounts of money, and different levels of quietness. For convenience, w 阅读全文
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Initially on a notepad only one character 'A' is present. You can perform two operations on this notepad for each step: Given a number n. You have to 阅读全文
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Given a list of positive integers, the adjacent integers will perform the float division. For example, [2,3,4] -> 2 / 3 / 4. However, you can add any 阅读全文
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There is a room with n lights which are turned on initially and 4 buttons on the wall. After performing exactly m unknown operations towards buttons, 阅读全文
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A sequence of number is called arithmetic if it consists of at least three elements and if the difference between any two consecutive elements is the 阅读全文
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In English, we have a concept called root, which can be followed by some other words to form another longer word - let's call this word successor. For 阅读全文
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In a N x N grid composed of 1 x 1 squares, each 1 x 1 square consists of a /, \, or blank space. These characters divide the square into contiguous re 阅读全文