Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on the telephon...
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其他好文 时间:
2014-06-25 09:15:12
阅读次数:
362
import stringimport randomdef get_rand(n): allw = string.letters+string.digits r = [] for i in range(n): r.append(random.choice(allw)) ...
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其他好文 时间:
2014-06-24 13:51:24
阅读次数:
320
题目很简单,只需要注意带空格的输入用getline即可#include #include #include #include #include using namespace std;int main(){ string str; getline(cin,str); set a; ...
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其他好文 时间:
2014-06-21 14:29:06
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200
题目:
Roman numerals come from the ancient Roman numbering system. They are based on specific letters of the alphabet which are combined to signify the sum (or, in some cases, the difference) of th...
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其他好文 时间:
2014-06-20 12:27:09
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394
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 telephone buttons) is given below.
In...
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其他好文 时间:
2014-06-18 12:03:16
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227
题目
A message containing letters from A-Z is being encoded to numbers using the following mapping:
原题链接(点我)
解题思路及代码;
解码方法数量问题。英文26个字母对应1到26,给一串数字,问翻译为字母有多少种方法?
这个题第一思路是想到使用组合排列的方法,穷举所有的可能。很好,写出如下代码...
但是提交后出来的结果是超时。
再想想,使用动态规划的方法来做。
对于串s[0...i]的解码数量应该和s[0.....
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其他好文 时间:
2014-06-13 20:44:04
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292
Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without
repeating letters for "abcabcbb" is "abc", which the length is 3. Fo...
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其他好文 时间:
2014-06-08 16:27:47
阅读次数:
231
题目
A message containing letters from A-Z is being encoded to numbers using
the following mapping:
'A' -> 1
'B' -> 2
...
'Z' -> 26
Given an encoded message containing digits, determine ...
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其他好文 时间:
2014-06-08 15:30:08
阅读次数:
182
题目:Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letters for "abcabcbb" is "abc", which the length is 3. For "bbbbb" the longest substring is "b", with the length...
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其他好文 时间:
2014-06-08 03:06:52
阅读次数:
221
Given a digit string, return all possible
letter combinations that the number could represent.A mapping of digit to
letters (just like on the telephon...
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其他好文 时间:
2014-06-06 17:50:38
阅读次数:
284