2022-07-01 update: added "Arithmetic Subarrays"

Author: fartem

src/main/java/com/smlnskgmail/jaman/leetcodejava/medium/ArithmeticSubarrays.java

@@ -0,0 +1,42 @@
+package com.smlnskgmail.jaman.leetcodejava.medium;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+// https://leetcode.com/problems/arithmetic-subarrays/
+public class ArithmeticSubarrays {
+
+    private final int[] nums;
+    private final int[] l;
+    private final int[] r;
+
+    public ArithmeticSubarrays(int[] nums, int[] l, int[] r) {
+        this.nums = nums;
+        this.l = l;
+        this.r = r;
+    }
+
+    public List<Boolean> solution() {
+        List<Boolean> result = new ArrayList<>();
+        for (int i = 0; i < l.length; i++) {
+            result.add(calculate(nums, l[i], r[i]));
+        }
+        return result;
+    }
+
+    private boolean calculate(int[] nums, int l, int r) {
+        List<Integer> n = new ArrayList<>();
+        for (int i = l; i < r + 1; i++) {
+            n.add(nums[i]);
+        }
+        Collections.sort(n);
+        for (int i = 0; i < n.size() - 1; i++) {
+            if (n.get(i + 1) - n.get(i) != n.get(1) - n.get(0)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+}

src/test/java/com/smlnskgmail/jaman/leetcodejava/medium/ArithmeticSubarraysTest.java

@@ -0,0 +1,23 @@
+package com.smlnskgmail.jaman.leetcodejava.medium;
+
+import org.junit.Test;
+
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class ArithmeticSubarraysTest {
+
+    @Test
+    public void defaultTest() {
+        assertEquals(
+                List.of(true, false, true),
+                new ArithmeticSubarrays(
+                        new int[]{4, 6, 5, 9, 3, 7},
+                        new int[]{0, 0, 2},
+                        new int[]{2, 3, 5}
+                ).solution()
+        );
+    }
+
+}