feat : climbing-stairs 문제풀이 완료

Author: KyoJin-Hwang

climbing-stairs/Kyojin-Hwang.js

@@ -0,0 +1,18 @@
+/**
+ * @param {number} n
+ * @return {number}
+ */
+var climbStairs = function(n) {
+  if (n <= 2) return n;
+
+  let prev1 = 1; 
+  let prev2 = 2; 
+  
+  for (let i = 3; i <= n; i++) {
+    const curr = prev1 + prev2; 
+    prev1 = prev2;
+    prev2 = curr;
+  }
+
+  return prev2;
+};