Update elimination-game.cpp

Author: kamyu104

C++/elimination-game.cpp

@@ -1,15 +1,15 @@
-// Time:  O(n)
+// Time:  O(logn)
 // Space: O(1)
 
 class Solution {
 public:
     int lastRemaining(int n) {
         int start = 1;
 
-        for (int i = n, step = 2, direction = 1; i > 1;
-             i /= 2, step *= 2, direction *= -1) {
+        for (int step = 2, direction = 1; n > 1;
+             n /= 2, step *= 2, direction *= -1) {
 
-            start += direction * (step * (i / 2) - step / 2);
+            start += direction * (step * (n / 2) - step / 2);
         }
 
         return start;