climbing-stairs solution

Author: ohgyulim

climbing-stairs/ohgyulim.java

@@ -0,0 +1,17 @@
+class Solution {
+    /* 시간 복잡도: O(N)
+    * - for 루프: O(N)
+    * 공간 복잡도: O(N), dp배열
+    */ 
+    public int climbStairs(int n) {
+        if (n == 1) return 1;
+        int[] dp = new int[n + 1];
+        dp[1] = 1;
+        dp[2] = 2;
+        for (int i = 3; i <= n; i++) {
+            dp[i] = dp[i - 1] + dp[i - 2];
+        }
+
+        return dp[n];
+    }
+}