add review 6 pdf and make empty R6.md

reviews/R5.md

@@ -309,7 +309,7 @@ if __name__ == "__main__":
     print(html_output)
 ```
 
-```
+```txt
 out 25 -> out 20 -> out 17 -> out 13 -> out 8
 ```
 
@@ -467,7 +467,7 @@ Fill in the blanks in the following pseudocode for Heapsort.
 
 ### Solution 2
 
-```{ .line-numbers }
+```txt { .line-numbers }
 HEAPSORT(A)
     BUILD-MAX-HEAP
     for i = A.length downto 2

reviews/R6.md

@@ -0,0 +1,5 @@
+# Review 6
+
+* Hajin Ju, 2024062806
+
+## Problem 1