Update Readme.md

Author: wisdompeak

Readme.md

@@ -174,13 +174,13 @@
 [699.Falling-Squares](https://github.com/wisdompeak/LeetCode/tree/master/Segment_Tree/699.Falling-Squares) (H)   
 [715.Range-Module](https://github.com/wisdompeak/LeetCode/tree/master/Segment_Tree/715.Range-Module) (H)    
 [729.My-Calendar-I](https://github.com/wisdompeak/LeetCode/tree/master/Heap/729.My-Calendar-I) (M)    
-[855.Exam-Room](https://github.com/wisdompeak/LeetCode/tree/master/Others/855.Exam-Room) (M+)    
+[855.Exam-Room](https://github.com/wisdompeak/LeetCode/tree/master/Heap/855.Exam-Room) (M+)    
 [975.Odd-Even-Jump](https://github.com/wisdompeak/LeetCode/tree/master/Heap/975.Odd-Even-Jump) (H-)    
 [632.Smallest-Range-Covering-Elements-from-K-Lists](https://github.com/wisdompeak/LeetCode/tree/master/Heap/632.Smallest-Range-Covering-Elements-from-K-Lists) (H-)  
 [1675.Minimize-Deviation-in-Array](https://github.com/wisdompeak/LeetCode/tree/master/Heap/1675.Minimize-Deviation-in-Array) (H)  
 [1296.Divide-Array-in-Sets-of-K-Consecutive-Numbers](https://github.com/wisdompeak/LeetCode/tree/master/Heap/1296.Divide-Array-in-Sets-of-K-Consecutive-Numbers) (M)  
 1348.Tweet-Counts-Per-Frequency (H-)    
-[1488.Avoid-Flood-in-The-City](https://github.com/wisdompeak/LeetCode/tree/master/Greedy/1488.Avoid-Flood-in-The-City) (H-)  
+[1488.Avoid-Flood-in-The-City](https://github.com/wisdompeak/LeetCode/tree/master/Heap/1488.Avoid-Flood-in-The-City) (H-)  
 [1606.Find-Servers-That-Handled-Most-Number-of-Requests](https://github.com/wisdompeak/LeetCode/tree/master/Heap/1606.Find-Servers-That-Handled-Most-Number-of-Requests) (M)  
 1797.Design Authentication Manager (M)  
 [1825.Finding-MK-Average](https://github.com/wisdompeak/LeetCode/tree/master/Heap/1825.Finding-MK-Average) (H)