> sample(1:6,4,replace=TRUE)[1] 4 5 2 6在1-6的整数中随机生成4个整数,且数字可以重复,即每个数字均可重复选择;>sample(LETTERS)随机生成26个英文字母>sample(c(0,1),100,replace = TRUE,prob = c(0.3,... ...
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编程语言 时间:
2017-07-24 17:32:34
阅读次数:
207
Implement a trie with insert, search, and startsWith methods. Note:You may assume that all inputs are consist of lowercase letters a-z. Implement a tr ...
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其他好文 时间:
2017-07-23 10:17:30
阅读次数:
181
Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from letters of sequentially adjacent cell, where "adjac ...
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其他好文 时间:
2017-07-23 10:09:39
阅读次数:
120
Given a 2D board and a list of words from the dictionary, find all words in the board. Each word must be constructed from letters of sequentially adja ...
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其他好文 时间:
2017-07-23 10:08:07
阅读次数:
214
Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letters fo ...
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其他好文 时间:
2017-07-22 21:11:05
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163
Given a char array representing tasks CPU need to do. It contains capital letters A to Z where different letters represent different tasks.Tasks could ...
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其他好文 时间:
2017-07-19 00:20:59
阅读次数:
161
Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telepho ...
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其他好文 时间:
2017-07-18 22:09:27
阅读次数:
185
题目: Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the tel ...
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编程语言 时间:
2017-07-18 20:11:36
阅读次数:
123
Description A string of lowercase letters is calledalphabeticalif deleting zero or more of its letters can result inthealphabet string"abcdefghijklmno ...
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其他好文 时间:
2017-07-18 15:47:50
阅读次数:
151
Given a string which contains only letters. Sort it by lower case first and upper case second. Notice It's NOT necessary to keep the original order of ...
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其他好文 时间:
2017-07-17 15:19:57
阅读次数:
216