Create nim-game.cpp

Author: kamyu104

C++/nim-game.cpp

@@ -0,0 +1,9 @@
+// Time:  O(1)
+// Soace: O(1)
+
+class Solution {
+public:
+    bool canWinNim(int n) {
+        return n % 4 != 0;
+    }
+};