Create 3136. Valid Word (#841)

Author: Chayandas07

3136. Valid Word

@@ -0,0 +1,18 @@
+// bitset version
+class Solution {
+public:
+    bool isValid(string& word) {
+        const int n=word.size();
+        if (n<3) return 0;
+        bitset<2> v=0;
+        constexpr unsigned vowels=1|(1<<('e'-'a'))|(1<<('o'-'a'))|(1<<('i'-'a'))|(1<<('u'-'a'));
+        for(char c: word){
+            if (!isalpha(c) && !isdigit(c)) return 0;
+            if (isalpha(c)){
+                unsigned i=(c>'Z')?c-'a':c-'A';
+                v[(vowels>>i)&1]=1;
+            }
+        }
+        return v==3;
+    }
+};