Create groups-of-special-equivalent-strings.cpp

Author: kamyu104

C++/groups-of-special-equivalent-strings.cpp

@@ -0,0 +1,17 @@
+// Time:  O(n * l)
+// Space: O(n)
+
+class Solution {
+public:
+    int numSpecialEquivGroups(vector<string>& A) {
+        unordered_set<string> lookup;
+        for (const auto& s: A) {
+            string count(52, 0);
+            for (int i = 0; i < s.length(); ++i) {
+                ++count[s[i] - 'a' + 26 * (i % 2)];
+            }
+            lookup.emplace(count);
+        }
+        return lookup.size();
+    }
+};