Add Solution.java for 0027.Remove Element

Author: huaxu1024

solution/0027.Remove Element/Solution2.java

@@ -0,0 +1,12 @@
+class Solution {
+    public int removeElement(int[] nums, int val) {
+        int res = 0, length = nums.length;
+        for (int i = 0; i < length; i ++) {
+            if (nums[i] != val) {
+                nums[res] = nums[i];
+                res ++;
+            }
+        }
+        return res;
+    }
+}

solution/0027.Remove Element/Solution3.java

@@ -0,0 +1,14 @@
+class Solution {
+    public int removeElement(int[] nums, int val) {
+        int limit = 0, length = nums.length;
+        for (int i = 0, j = 0; i < length - limit; i ++) {
+            while (j < length && nums[j ++] == val) {
+                limit ++;
+            }
+            if (i + limit < length) {
+                nums[i] = nums[i + limit];
+            }
+        }
+        return length - limit;
+    }
+}