will be helpful for those in need First off, for the sake of clarity I suggest assigning your list comprehensions to variables so you don't have to write each one twice. This should make the code easier to debug. You can also do the same for the (left+right)//2 value.

code :

```
def max22(L,left,right):
if len(L)==1:
return L[0]
mid = (left+right)//2
left_L = [L[i] for i in range(left, mid)]
right_L = [L[i] for i in range(mid+1, right)]
a = max22(left_L, 0 , len(left_L)-1)
b = max22(right_L, 0 , len(left_L)-1)
return max(a,b)
def max_list22(L):
return max22(L,0,len(L)-1)
print max_list22([4,8,15,16,23,42])
```

```
def max22(L,left,right):
if len(L)==1:
return L[0]
mid = (left+right+1)//2
left_L = [L[i] for i in range(left, mid)]
right_L = [L[i] for i in range(mid, right+1)]
a = max22(left_L, 0 , len(left_L)-1)
b = max22(right_L, 0 , len(right_L)-1)
return max(a,b)
def max_list22(L):
return max22(L,0,len(L)-1)
print max_list22([4,8,15,16,23,42])
```

```
def max22(L,left,right):
if len(L)==1:
return L[0]
a = max22([L[i] for i in range(left, (left+right+1)//2)], 0 , len([L[i] for i in range(left, (left+right+1)//2)])-1)
b = max22([L[i] for i in range((left+right+1)//2, right+1)], 0 , len([L[i] for i in range((left+right+1)//2, right+1)])-1)
return max(a,b)
def max_list22(L):
return max22(L,0,len(L)-1)
print max_list22([4,8,15,16,23,42])
```

```
def max22(L):
if len(L)==1:
return L[0]
mid = (len(L))//2
left_L = [L[i] for i in range(0, mid)]
right_L = [L[i] for i in range(mid, len(L))]
a = max22(left_L)
b = max22(right_L)
return max(a,b)
print max22([4,8,15,16,23,42])
```