Update Readme.md

wisdompeak · web-flow · commit 164902573fae · 2021-12-17T06:40:18.000-08:00
diff --git a/Readme.md b/Readme.md
@@ -319,8 +319,9 @@
 [739.Daily-Temperatures](https://github.com/wisdompeak/LeetCode/tree/master/Stack/739.Daily-Temperatures)  (H-)    
 [768.Max-Chunks-To-Make-Sorted-II](https://github.com/wisdompeak/LeetCode/tree/master/Stack/768.Max-Chunks-To-Make-Sorted-II) (H-)   
 [901.Online-Stock-Span](https://github.com/wisdompeak/LeetCode/tree/master/Stack/901.Online-Stock-Span) (H-)   
-[907.Sum-of-Subarray-Minimums](https://github.com/wisdompeak/LeetCode/tree/master/Stack/907.Sum-of-Subarray-Minimums) (H)   
+[907.Sum-of-Subarray-Minimums](https://github.com/wisdompeak/LeetCode/tree/master/Stack/907.Sum-of-Subarray-Minimums) (H-)   
 [1856.Maximum-Subarray-Min-Product](https://github.com/wisdompeak/LeetCode/tree/master/Stack/1856.Maximum-Subarray-Min-Product) (M+)  
+[2104.Sum-of-Subarray-Ranges](https://github.com/wisdompeak/LeetCode/tree/master/Stack/2104.Sum-of-Subarray-Ranges) (H-)      
 [962.Maximum-Width-Ramp](https://github.com/wisdompeak/LeetCode/tree/master/Stack/962.Maximum-Width-Ramp) (H)    
 [1019.Next-Greater-Node-In-Linked-List](https://github.com/wisdompeak/LeetCode/tree/master/Stack/1019.Next-Greater-Node-In-Linked-List) (M)    
 [1063.Number-of-Valid-Subarrays](https://github.com/wisdompeak/LeetCode/tree/master/Stack/1063.Number-of-Valid-Subarrays) (M+)    
