refactor 70

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_70.java

@@ -1,67 +1,42 @@
 package com.fishercoder.solutions;
 
-/**
- * 70. Climbing Stairs
-
- You are climbing a stair case. It takes n steps to reach to the top.
- Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?
-
- Note: Given n will be a positive integer.
-
- Example 1:
- Input: 2
- Output:  2
- Explanation:  There are two ways to climb to the top.
- 1. 1 step + 1 step
- 2. 2 steps
-
- Example 2:
- Input: 3
- Output:  3
- Explanation:  There are three ways to climb to the top.
- 1. 1 step + 1 step + 1 step
- 2. 1 step + 2 steps
- 3. 2 steps + 1 step
-
- */
-
 public class _70 {
-  public static class Solution1 {
-    /**
-     * O(n) time
-     * O(n) space
-     * */
-    public int climbStairs(int n) {
-      if (n == 1) {
-        return n;
-      }
-      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];
+    public static class Solution1 {
+        /**
+         * O(n) time
+         * O(n) space
+         */
+        public int climbStairs(int n) {
+            if (n == 1) {
+                return n;
+            }
+            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];
+        }
     }
-  }
 
-  public static class Solution2 {
-    /**
-     * O(n) time
-     * O(1) space
-     * */
-    public int climbStairs(int n) {
-      if (n == 1) {
-        return n;
-      }
-      int stepOne = 1;
-      int stepTwo = 2;
-      for (int i = 3; i <= n; i++) {
-        int tmp = stepTwo;
-        stepTwo = stepOne + stepTwo;
-        stepOne = tmp;
-      }
-      return stepTwo;
+    public static class Solution2 {
+        /**
+         * O(n) time
+         * O(1) space
+         */
+        public int climbStairs(int n) {
+            if (n == 1) {
+                return n;
+            }
+            int stepOne = 1;
+            int stepTwo = 2;
+            for (int i = 3; i <= n; i++) {
+                int tmp = stepTwo;
+                stepTwo = stepOne + stepTwo;
+                stepOne = tmp;
+            }
+            return stepTwo;
+        }
     }
-  }
 }