update

Author: LuoHong

Code/Java/1.两数之和/TwoSum.java

@@ -0,0 +1,26 @@
+import java.util.HashMap;
+import java.util.Arrays;
+import java.util.Map;
+
+public class TwoSum {
+
+   public static void main(String[] args) {
+
+      int[] nums = {2, 7, 11, 15};
+      int[] result = new TwoSum().twoSum(nums, 9);
+      System.out.println(Arrays.toString(result));
+    }
+
+    public int[] twoSum(int[] nums, int target) {
+        Map<Integer, Integer> map = new HashMap<>();
+        for (int i = 0; i < nums.length; i++) {
+          
+          int temp = target - nums[i];
+          if (map.containsKey(temp)) {
+            return new int[] {map.get(temp), i};
+          }
+          map.put(nums[i], i);
+        }
+        return new int[0];
+    }
+}

Code/Java/1/TwoSum.java

@@ -7,6 +7,12 @@
 
 | Title | Solution | Topic | Note | Difficulty | 
 | ----- | -------- | ----- | ---- | ---------- |
-|[1.Two Sum](https://leetcode.com/problems/reverse-integer/) |[Java](./Code/Java/7.整数反转/reverseinteger.java)|`Array` `HashTable` `Math` | |Easy|
-|[7. Reverse Integer](https://leetcode.com/problems/reverse-integer/) |[Java](./Code/Java/7.整数反转/reverseinteger.java)|`Math` | |Easy|
-|[1.Two Sum](https://leetcode.com/problems/two-sum/) |[Java](./Code/Java/1.两数之和/TwoSum.java)|`Array` `HashTable` | |Easy|
+|[283.Move Zeroes](https://leetcode.com/problems/move-zeroes/) | [Java](./Code/Java/283/MoveZeroes.java)| `Array` `Two Pointers` | |Easy|
+|[88.Merge Sorted Array](https://leetcode.com/problems/merge-sorted-array/) | [Java](./Code/Java/88/MergeSortedArray.java)|`Array` `Two Pointers`| |Easy|
+|[66.Plus One](https://leetcode.com/problems/plus-one/) | [Java](./Code/Java/66/PlusOne.java)| `Array` | |Easy|
+|[27.Remove Element](https://leetcode.com/problems/remove-element/) | [Java](./Code/Java/27/RemoveElement.java)| `Array` `Two Pointers` | |Easy|
+|[26.Remove Duplicates from Sorted Array](https://leetcode.com/problems/remove-duplicates-from-sorted-array/) | [Java](./Code/Java/26/RemoveDuplicatesFromSortedArray.java)| `Array` `Two Pointers`| |Easy|
+|[13.Roman to Integer](https://leetcode.com/problems/roman-to-integer/) | [Java](./Code/Java/13/RomanToInteger.java)|`Math` | |Easy|
+|[9.Palindrome Number](https://leetcode.com/problems/palindrome-number/) | [Java](./Code/Java/9/PalindromeNumber.java)|`Math` | |Easy|
+|[7.Reverse Integer](https://leetcode.com/problems/reverse-integer/) | [Java](./Code/Java/7/ReverseInteger.java)|`Math` | |Easy|
+|[1.Two Sum](https://leetcode.com/problems/two-sum/) | [Java](./Code/Java/1/TwoSum.java)|`Array` `HashTable` | |Easy|

Code/Java/13.罗马数字转整数/RomanToInteger.java renamed to Code/Java/13/RomanToInteger.java

@@ -6,6 +6,16 @@
 
 | 题目 | 解答 | 话题 | 笔记 | 难度 | 
 | ----- | -------- | ----- | ---- | ---------- |
-|[](https://leetcode-cn.com/problems/two-sum/) | [Java](./Code/Java/)|`数组` `哈希表` `双指针` `字符串` `数学` | |Easy|
-|[7.整数反转](https://leetcode-cn.com/problems/reverse-integer/) | [Java](./Code/Java/7.整数反转/reverseinteger.java)| `数学` | |Easy|
-|[1. 两数之和](https://leetcode-cn.com/problems/two-sum/) | [Java](./Code/Java/1.两数之和/TwoSum.java)|`数组` `哈希表` | |Easy|
+|[283. 移动零](https://leetcode-cn.com/problems/move-zeroes/) | [Java](./Code/Java/283/MoveZeroes.java)| `数组` `双指针` | |Easy|
+|[88. 合并两个有序数组](https://leetcode-cn.com/problems/merge-sorted-array/) | [Java](./Code/Java/88/MergeSortedArray.java)|`数组` `双指针`| |Easy|
+|[66. 加一](https://leetcode-cn.com/problems/plus-one/) | [Java](./Code/Java/66/PlusOne.java)|`数组`| |Easy|
+|[27. 移除元素](https://leetcode-cn.com/problems/remove-element/) | [Java](./Code/Java/27/RemoveElement.java)|`数组` `双指针`| |Easy|
+|[26. 删除排序数组中的重复项](https://leetcode-cn.com/problems/remove-duplicates-from-sorted-array/) | [Java](./Code/Java/26/RemoveDuplicatesFromSortedArray.java)|`数组` `双指针` | |Easy|
+|[13. 罗马数字转整数](https://leetcode-cn.com/problems/roman-to-integer/) | [Java](./Code/Java/13/RomanToInteger.java)|`数学` | |Easy|
+|[9. 回文数](https://leetcode-cn.com/problems/palindrome-number/) | [Java](./Code/Java/9/PalindromeNumber.java)|`数学` | |Easy|
+|[7. 整数反转](https://leetcode-cn.com/problems/reverse-integer/) | [Java](./Code/Java/7/ReverseInteger.java)|`数学` | |Easy|
+|[1. 两数之和](https://leetcode-cn.com/problems/two-sum/) | [Java](./Code/Java/1/TwoSum.java)|`数组` `哈希表` | |Easy|
+
+
+
+