add 200 to notes

Author: Li Li

README.md

@@ -3,7 +3,7 @@
 I will use this repository to make notes for leetcode solutions and classify the problems by different topics.
 
 ## Solved Problem List
-Total solved: 90
+Total solved: 91
 
 ### microsoft-labed
 ID | Difficulty | Tags | Solution | Similar Problem
@@ -13,7 +13,7 @@ ID | Difficulty | Tags | Solution | Similar Problem
 273 | Hard | Math, string | [Integer to English Words](https://github.com/kflili/LeetcodeCShaprDotNetCore/blob/master/top-interview-questions/273.%20Integer%20to%20English%20Words.cs)
 54 | Medium | Array | [Spiral Matrix](https://github.com/kflili/LeetcodeCShaprDotNetCore/blob/master/top-interview-questions/54.%20Spiral%20Matrix.cs)
 235 | Medium | BST | [Lowest Common Ancestor of a Binary Search Tree](https://github.com/kflili/LeetcodeCShaprDotNetCore/blob/master/top-interview-questions/235.%20Lowest%20Common%20Ancestor%20of%20a%20Binary%20Search%20Tree.cs)
-
+200 | Medium | BFS, DFS | [Number of Islands]https://github.com/kflili/LeetcodeCShaprDotNetCore/blob/master/top-interview-questions/200.%20Number%20of%20Islands.cs()
 
 ### top-interview-questions