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Author: assassint2017

Keyboard Row/Keyboard_Row.cpp

@@ -0,0 +1,58 @@
+// Runtime: 0 ms, faster than 100.00% of C++ online submissions for Keyboard Row.
+// Memory Usage: 8.6 MB, less than 57.14% of C++ online submissions for Keyboard Row.
+
+class Solution 
+{
+public:
+    vector<string> findWords(vector<string>& words) 
+    {
+        vector<string> res;
+        
+        vector<int> memo(26, 0);
+        
+        // 从上往下数第二层
+        memo['a' - 'a'] = 1;
+        memo['s' - 'a'] = 1;
+        memo['d' - 'a'] = 1;
+        memo['f' - 'a'] = 1;
+        memo['g' - 'a'] = 1;
+        memo['h' - 'a'] = 1;
+        memo['j' - 'a'] = 1;
+        memo['k' - 'a'] = 1;
+        memo['l' - 'a'] = 1;
+        
+        // 从上往下数第三层
+        memo['z' - 'a'] = 2;
+        memo['x' - 'a'] = 2;
+        memo['c' - 'a'] = 2;
+        memo['v' - 'a'] = 2;
+        memo['b' - 'a'] = 2;
+        memo['n' - 'a'] = 2;
+        memo['m' - 'a'] = 2;
+        
+        for (string word : words)
+        {
+            bool flag = true;
+            
+            if (word.length() != 0)
+            {
+                char temp = word[0] >= 'a' && word[0] <= 'z' ? word[0] : word[0] + 32;
+                int layer = memo[temp - 'a'];
+                
+                for (char chr : word)
+                {
+                    chr = chr >= 'a' && chr <= 'z' ? chr : chr + 32;
+                    if (memo[chr - 'a'] != layer)
+                    {
+                        flag = false;
+                        break;
+                    }
+                }
+            }
+            
+            if (flag) res.push_back(word);    
+        }
+        
+        return res;
+    }
+};