Left and Right sum differences

src/main/java/leetcode/easy/LeftAndRightSumDifferences.java

@@ -0,0 +1,33 @@
+package leetcode.easy;
+
+public class LeftAndRightSumDifferences {
+
+  int[] leftRightDifference(int[] nums) {
+
+    int rightSum = 0;
+    int leftSum = 0;
+
+    // Calculate the total right sum
+    for (int num : nums) {
+      rightSum += num;
+    }
+
+    // Iterate through the array
+    for (int i = 0; i < nums.length; i++) {
+      // Get the value at index i
+      int val = nums[i];
+
+      // Update the right sum
+      rightSum -= val;
+
+      // Find the difference
+      nums[i] = Math.abs(leftSum - rightSum);
+
+      // Update the left sum
+      leftSum += val;
+    }
+
+    return nums;
+  }
+
+}

src/test/java/leetcode/easy/LeftAndRightSumDifferencesTest.java

@@ -0,0 +1,49 @@
+package leetcode.easy;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class LeftAndRightSumDifferencesTest {
+
+  private final LeftAndRightSumDifferences leftAndRightSumDifferences;
+
+  LeftAndRightSumDifferencesTest() {
+    leftAndRightSumDifferences = new LeftAndRightSumDifferences();
+  }
+
+  @Test
+  void testLeftRightDifference1() {
+    int[] nums = {10, 4, 8, 3};
+    int[] expected = {15, 1, 11, 22};
+    assertArrayEquals(expected, leftAndRightSumDifferences.leftRightDifference(nums));
+  }
+
+  @Test
+  void testLeftRightDifference2() {
+    int[] nums = {4, 2, 1, 3};
+    int[] expected = {6, 0, 3, 7};
+    assertArrayEquals(expected, leftAndRightSumDifferences.leftRightDifference(nums));
+  }
+
+  @Test
+  void testLeftRightDifference3() {
+    int[] nums = {1, 2, 3, 4};
+    int[] expected = {9, 6, 1, 6};
+    assertArrayEquals(expected, leftAndRightSumDifferences.leftRightDifference(nums));
+  }
+
+  @Test
+  void testLeftRightDifference4() {
+    int[] nums = {1, 1, 1, 1};
+    int[] expected = {3, 1, 1, 3};
+    assertArrayEquals(expected, leftAndRightSumDifferences.leftRightDifference(nums));
+  }
+
+  @Test
+  void testLeftRightDifference5() {
+    int[] nums = {1};
+    int[] expected = {0};
+    assertArrayEquals(expected, leftAndRightSumDifferences.leftRightDifference(nums));
+  }
+}