Update Readme.md

wisdompeak · web-flow · commit 563acdf0ebf9 · 2021-09-06T00:45:48.000-07:00
diff --git a/Readme.md b/Readme.md
@@ -1077,6 +1077,7 @@
 [1861.Rotating-the-Box](https://github.com/wisdompeak/LeetCode/tree/master/Others/1861.Rotating-the-Box) (M)  
 [1862.Sum-of-Floored-Pairs](https://github.com/wisdompeak/LeetCode/tree/master/Others/1862.Sum-of-Floored-Pairs) (M+)  
 [1904.The-Number-of-Full-Rounds-You-Have-Played](https://github.com/wisdompeak/LeetCode/tree/master/Others/1904.The-Number-of-Full-Rounds-You-Have-Played) (M)  
+[1997.First-Day-Where-You-Have-Been-in-All-the-Rooms](https://github.com/wisdompeak/LeetCode/tree/master/Others/1997.First-Day-Where-You-Have-Been-in-All-the-Rooms) (H)     
 * ``扫描线 / 差分数组``   
 [252.Meeting-Rooms](https://github.com/wisdompeak/LeetCode/tree/master/Others/252.Meeting-Rooms) (M)  
 [253.Meeting-Rooms-II](https://github.com/wisdompeak/LeetCode/tree/master/Others/253.Meeting-Rooms-II) (M+)    
