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27-remove-element/27-remove-element.java

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+class Solution {
+    public int removeElement(int[] nums, int val) {
+        if (nums.length == 0) {
+            return 0;
+        }
+
+        int backIndex = nums.length - 1;
+        for (int i = 0; i < backIndex; ++i) {
+            if (nums[i] == val) {
+                while (nums[backIndex] == val) {
+                    backIndex--;
+                    if (backIndex == i) {
+                        return nums[backIndex] == val ? backIndex : backIndex + 1;
+                    }
+                }
+                nums[i] = nums[backIndex];
+                nums[backIndex] = val;
+                backIndex--;
+            }
+        }
+        return nums[backIndex] == val ? backIndex : backIndex + 1;
+    }
+}