Improve solution for 908 (#48)

Author: havanagrawal

README.md

@@ -61,7 +61,7 @@ Your ideas/fixes/algorithms are more than welcome!
 |925|[Long Pressed Name](https://leetcode.com/problems/long-pressed-name/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_925.java) | O(n) | O(1) | |Easy|
 |922|[Sort Array By Parity II](https://leetcode.com/problems/sort-array-by-parity-ii/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_922.java) | O(n) | O(1) | |Easy|
 |917|[Reverse Only Letters](https://leetcode.com/problems/reverse-only-letters/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_917.java) | O(n) | O(n) | |Easy|
-|908|[Smallest Range I](https://leetcode.com/problems/smallest-range-i/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_908.java) | O(nlogn) | O(1) | |Easy|
+|908|[Smallest Range I](https://leetcode.com/problems/smallest-range-i/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_908.java) | O(n) | O(1) | |Easy|
 |900|[RLE Iterator](https://leetcode.com/problems/rle-iterator/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_900.java) | O(n) | O(1) | |Medium|
 |897|[Increasing Order Search Tree](https://leetcode.com/problems/increasing-order-search-tree/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_897.java) | O(n) | O(n) | |Easy| DFS, recursion
 |896|[Monotonic Array](https://leetcode.com/problems/monotonic-array/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_896.java) | O(n) | O(1) | |Easy|

src/main/java/com/fishercoder/solutions/_908.java

@@ -37,17 +37,31 @@
  * 0 <= K <= 10000
  */
 public class _908 {
-  public static class Solution1 {
-    public int smallestRangeI(int[] A, int K) {
-      Arrays.sort(A);
-      int smallestPlus = A[0] + K;
-      int biggestMinus = A[A.length - 1] - K;
-      int diff = biggestMinus - smallestPlus;
-      if (diff > 0) {
-        return diff;
-      } else {
-        return 0;
+    public static class Solution1 {
+        public int smallestRangeI(int[] A, int K) {
+          Arrays.sort(A);
+          int smallestPlus = A[0] + K;
+          int biggestMinus = A[A.length - 1] - K;
+          int diff = biggestMinus - smallestPlus;
+          if (diff > 0) {
+              return diff;
+          } else {
+              return 0;
+          }
+      }
+  }
+
+  public static class Solution2 {
+      public int smallestRangeI(int[] A, int K) {
+          int min = A[0];
+          int max = A[0];
+
+          for (int k : A) {
+            min = Math.min(min, k);
+            max = Math.max(max, k);
+          }
+
+          return Math.max(max - min - 2*K, 0);
       }
-    }
   }
 }

src/test/java/com/fishercoder/_908Test.java

@@ -8,28 +8,33 @@
 
 public class _908Test {
   private static _908.Solution1 solution1;
+  private static _908.Solution2 solution2;
   private static int[] A;
 
   @BeforeClass
   public static void setup() {
     solution1 = new _908.Solution1();
+    solution2 = new _908.Solution2();
   }
 
   @Test
   public void test1() {
     A = new int[] {1};
     assertEquals(0, solution1.smallestRangeI(A, 0));
+    assertEquals(0, solution2.smallestRangeI(A, 0));
   }
 
   @Test
   public void test2() {
     A = new int[] {0, 10};
     assertEquals(6, solution1.smallestRangeI(A, 2));
+    assertEquals(6, solution2.smallestRangeI(A, 2));
   }
 
   @Test
   public void test3() {
     A = new int[] {1, 3, 6};
     assertEquals(0, solution1.smallestRangeI(A, 3));
+    assertEquals(0, solution2.smallestRangeI(A, 3));
   }
 }