441. Arranging Coins

Author: amitbansal7

.gitignore

@@ -0,0 +1,7 @@
+.DS_Store
+.DS_Store?
+*.txt
+a.out
+c.c
+IC
+.class

arranging-coins.cpp

@@ -0,0 +1,7 @@
+//Runtime: 35 ms
+class Solution {
+public:
+    int arrangeCoins(int n) {
+        return floor(-0.5 + sqrt((double)2*n+0.25));
+    }
+};