refactor 643

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_643.java

@@ -2,44 +2,32 @@
 
 /**
  * 643. Maximum Average Subarray I
- *
  * Given an array consisting of n integers, find the contiguous subarray of given length k that has the maximum average value.
  * And you need to output the maximum average value.
-
- Example 1:
- Input: [1,12,-5,-6,50,3], k = 4
- Output: 12.75
- Explanation: Maximum average is (12-5-6+50)/4 = 51/4 = 12.75
- Note:
- 1 <= k <= n <= 30,000.
- Elements of the given array will be in the range [-10,000, 10,000].
+ * Example 1:
+ * Input: [1,12,-5,-6,50,3], k = 4
+ * Output: 12.75
+ * Explanation: Maximum average is (12-5-6+50)/4 = 51/4 = 12.75
+ * Note:
+ * 1 <= k <= n <= 30,000.
+ * Elements of the given array will be in the range [-10,000, 10,000].
  */
 public class _643 {
 
-    public static double findMaxAverage(int[] nums, int k) {
-        double sum = 0;
-        double maxAve = Integer.MIN_VALUE;
-        for (int i = 0; i < nums.length; i++) {
-            if (k <= i) {
-                sum -= nums[i - k];
-            }
-            sum += nums[i];
-            if ((i + 1) >= k) {
-                maxAve = Math.max(maxAve, sum / k);
+    public static class Solution1 {
+        public double findMaxAverage(int[] nums, int k) {
+            double sum = 0;
+            double maxAve = Integer.MIN_VALUE;
+            for (int i = 0; i < nums.length; i++) {
+                if (k <= i) {
+                    sum -= nums[i - k];
+                }
+                sum += nums[i];
+                if ((i + 1) >= k) {
+                    maxAve = Math.max(maxAve, sum / k);
+                }
             }
+            return maxAve;
         }
-        return maxAve;
-    }
-
-    public static void main(String... args) {
-//        int[] nums = new int[]{1,12,-5,-6,50,3};
-//        int k = 4;
-
-//        int[] nums = new int[]{-1};
-//        int k = 1;
-
-        int[] nums = new int[]{-6662, 5432, -8558, -8935, 8731, -3083, 4115, 9931, -4006, -3284, -3024, 1714, -2825, -2374, -2750, -959, 6516, 9356, 8040, -2169, -9490, -3068, 6299, 7823, -9767, 5751, -7897, 6680, -1293, -3486, -6785, 6337, -9158, -4183, 6240, -2846, -2588, -5458, -9576, -1501, -908, -5477, 7596, -8863, -4088, 7922, 8231, -4928, 7636, -3994, -243, -1327, 8425, -3468, -4218, -364, 4257, 5690, 1035, 6217, 8880, 4127, -6299, -1831, 2854, -4498, -6983, -677, 2216, -1938, 3348, 4099, 3591, 9076, 942, 4571, -4200, 7271, -6920, -1886, 662, 7844, 3658, -6562, -2106, -296, -3280, 8909, -8352, -9413, 3513, 1352, -8825};
-        int k = 90;
-        System.out.println(findMaxAverage(nums, k));
     }
 }

src/test/java/com/fishercoder/_643Test.java

@@ -0,0 +1,35 @@
+package com.fishercoder;
+
+import com.fishercoder.solutions._643;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class _643Test {
+    private static _643.Solution1 solution1;
+    private static int[] nums;
+
+    @BeforeClass
+    public static void setup() {
+        solution1 = new _643.Solution1();
+    }
+
+    @Test
+    public void test1() {
+        nums = new int[]{1, 12, -5, -6, 50, 3};
+        assertEquals(12.75, solution1.findMaxAverage(nums, 4), 0.01);
+    }
+
+    @Test
+    public void test2() {
+        nums = new int[]{-1};
+        assertEquals(-1.0, solution1.findMaxAverage(nums, 1), 0.01);
+    }
+
+    @Test
+    public void test3() {
+        nums = new int[]{-6662, 5432, -8558, -8935, 8731, -3083, 4115, 9931, -4006, -3284, -3024, 1714, -2825, -2374, -2750, -959, 6516, 9356, 8040, -2169, -9490, -3068, 6299, 7823, -9767, 5751, -7897, 6680, -1293, -3486, -6785, 6337, -9158, -4183, 6240, -2846, -2588, -5458, -9576, -1501, -908, -5477, 7596, -8863, -4088, 7922, 8231, -4928, 7636, -3994, -243, -1327, 8425, -3468, -4218, -364, 4257, 5690, 1035, 6217, 8880, 4127, -6299, -1831, 2854, -4498, -6983, -677, 2216, -1938, 3348, 4099, 3591, 9076, 942, 4571, -4200, 7271, -6920, -1886, 662, 7844, 3658, -6562, -2106, -296, -3280, 8909, -8352, -9413, 3513, 1352, -8825};
+        assertEquals(37.25555555555555, solution1.findMaxAverage(nums, 90), 0.01);
+    }
+}