500. Keyboard Row

2019-11-11 04:05:40

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Given a List of Words, return the words that can be typed using letters of alphabet on only one row's of American keyboard like the image below.

American keyboard

Example 1:

Input: ["Hello", "Alaska", "Dad", "Peace"]Output: ["Alaska", "Dad"]Note:
You may use one character in the keyboard more than once.You may assume the input string will only contain letters of alphabet.Subscribe to see which companies asked this question.
判断一个单词的字母是否都在键盘的同一行。
代码：
class Solution{public:	vector<string> findWords(vector<string>& words) 	{		s = "QWERTYUIOP";		make_map(1);		s = "ASDFGHJKL";		make_map(2);		s = "ZXCVBNM";		make_map(3);		vector<string>res;		for(auto word:words)		{			int n = 0;			for(auto c:word)			{				int k = toupper(c) - 'A';				if(n != 0 && n != map[k]) 				{					n = 4;					break;				}				n = map[k];			}			if(n < 4) res.push_back(word);		}		return res;	}PRivate:	int map[26];	string s;	void make_map(int n)	{		for(auto c:s)		{			map[c-'A'] = n;		}	}};