feat: 70. Climbing Stairs

Author: gwbaik9717

climbing-stairs/gwbaik9717.js

@@ -0,0 +1,18 @@
+// Time complexity: O(n)
+// Space complexity: O(n)
+
+/**
+ * @param {number} n
+ * @return {number}
+ */
+var climbStairs = function (n) {
+  const dp = Array.from({ length: n + 1 }, () => 0);
+  dp[0] = 1;
+  dp[1] = 1;
+
+  for (let i = 2; i <= n; i++) {
+    dp[i] = dp[i - 1] + dp[i - 2];
+  }
+
+  return dp[n];
+};