Fix index off by 1

qselect.py

@@ -7,9 +7,9 @@ def qselect(i, xs):
     left = [x for x in xs if x < pivot]
     right = [x for x in xs if x >= pivot]
 
-    if i > len(left):
+    if i > len(left) + 1:
         return qselect(i - len(left) - 1, right)
-    elif i == len(left):
+    elif i == len(left) + 1:
         return pivot
     else:
         return qselect(i, left)