初始化

src/cn/celess/leetcode/topinterview150/test26/Main.java

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+package cn.celess.leetcode.topinterview150.test26;
+
+public class Main {
+    public static void main(String[] args) {
+        int[] nums = {0,0,1,1,1,2,2,3,3,4}; // 输入数组
+        int[] expectedNums = {0,1,2,3,4}; // 长度正确的期望答案
+
+        int k = new Solution().removeDuplicates(nums); // 调用
+
+        assert k == expectedNums.length;
+        for (int i = 0; i < k; i++) {
+            System.out.println(nums[i]);
+            assert nums[i] == expectedNums[i];
+        }
+    }
+}

src/cn/celess/leetcode/topinterview150/test26/Solution.java

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+package cn.celess.leetcode.topinterview150.test26;
+
+class Solution {
+    public int removeDuplicates(int[] nums) {
+        if(nums.length == 1){
+            return 1;
+        }
+
+        int left = 0;
+        int right = 1;
+
+        int[] arr = new int[nums.length];
+
+        arr[0] = nums[0];
+        int len = 1;
+        while(right < nums.length){
+
+            if(nums[left] == nums[right]){
+                left++;
+                right++;
+                continue;
+            }
+            arr[len++] = nums[right];
+            left++;
+            right++;
+        }
+
+        for(int j = 0; j < len; j++){
+            nums[j] = arr[j];
+        }
+
+
+        return len;
+    }
+}

src/cn/celess/leetcode/topinterview150/test27/Main.java

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+package cn.celess.leetcode.topinterview150.test27;
+
+import java.util.Arrays;
+
+public class Main {
+    public static void main(String[] args) {
+        int[] nums = new int[]{0, 1, 2, 2, 3, 0, 4, 2}; // 输入数组
+        int val = 2; // 要移除的值
+        int[] expectedNums = {0, 1, 3, 0, 4}; // 长度正确的预期答案。
+        // 它以不等于 val 的值排序。
+
+        int k = new Solution().removeElement(nums, val); // 调用你的实现
+
+        assert k == expectedNums.length;
+        int actualLength = k;
+        Arrays.sort(nums, 0, k); // 排序 nums 的前 k 个元素
+        for (int i = 0; i < actualLength; i++) {
+            System.out.println(nums[i]);
+            assert nums[i] == expectedNums[i];
+        }
+
+//
+//        int[] nums = new int[]{1}; // 输入数组
+//        int val = 1; // 要移除的值
+//        int[] expectedNums = {}; // 长度正确的预期答案。
+//        // 它以不等于 val 的值排序。
+//
+//        int k = new Solution().removeElement(nums, val); // 调用你的实现
+//
+//        assert k == expectedNums.length;
+//        int actualLength = k;
+//        Arrays.sort(nums, 0, k); // 排序 nums 的前 k 个元素
+//        for (int i = 0; i < actualLength; i++) {
+//            System.out.println(nums[i]);
+//            assert nums[i] == expectedNums[i];
+//        }
+    }
+}

src/cn/celess/leetcode/topinterview150/test27/Solution.java

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+package cn.celess.leetcode.topinterview150.test27;
+
+class Solution {
+    public int removeElement(int[] nums, int val) {
+        int head = 0;
+        int tail = nums.length - 1;
+
+        while (tail >= 0 && head <= tail) {
+
+            if (nums[tail] == val) {
+                tail--;
+                continue;
+            }
+            if (nums[head] == val) {
+                int tmp = nums[head];
+                nums[head] = nums[tail];
+                nums[tail] = tmp;
+                head++;
+                tail--;
+                continue;
+            }
+            head++;
+        }
+        return  head ;
+    }
+}

src/cn/celess/leetcode/topinterview150/test80/Solution.java

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+package cn.celess.leetcode.topinterview150.test80;
+
+public class Solution {
+
+    public int removeDuplicates(int[] nums) {
+        int slow = 2;
+        int fast = 2;
+
+        while (fast < nums.length) {
+            if (nums[fast] != nums[slow - 2]) {
+                nums[slow++] = nums[fast];
+            }
+            fast++;
+        }
+        return slow;
+    }
+}
+
+
+class Main {
+    public static void main(String[] args) {
+        int[] nums = {0, 0};
+        int len = new Solution().removeDuplicates(nums);
+        for (int i = 0; i < len; i++) {
+            System.out.println(nums[i]);
+        }
+        System.out.println("=====");
+        System.out.println(len);
+    }
+}