Created Remove Duplicate From Sorted Array

src/main/java/com/thealgorithms/others/RemoveDuplicatesFromSortedArray.java

@@ -0,0 +1,41 @@
+package com.thealgorithms.others;
+
+/**
+ * Removes duplicates from a sorted integer array in-place
+ * using the two-pointer technique and O(1) extra space.
+ *
+ * <p>
+ * Example:
+ * Input:  [1, 1, 2, 2, 3]
+ * Output: 3, and the array becomes [1, 2, 3, _, _]
+ * </p>
+ */
+public final class RemoveDuplicatesFromSortedArray {
+
+    private RemoveDuplicatesFromSortedArray() {
+        // Utility class, no instantiation
+    }
+
+    /**
+     * Removes duplicates from a sorted array in-place.
+     *
+     * @param nums the sorted input array (non-decreasing order)
+     * @return the number of unique elements
+     */
+    public static int removeDuplicates(int[] nums) {
+        if (nums == null || nums.length == 0) {
+            return 0;
+        }
+
+        int j = 0; // Pointer for the last unique element
+
+        for (int i = 1; i < nums.length; i++) {
+            if (nums[j] != nums[i]) {
+                j++;
+                nums[j] = nums[i];
+            }
+        }
+
+        return j + 1;
+    }
+}