Question

1. Write another function buddies(...) that receives a list (with at least 3 integer numbers), and returns the number of pairs of buddies in the list. We will define a “pair of buddies” to be the pair of elements that are contiguous in the list and that are equal, and also so that the contiguous elements to the pair are different (or the pair is in an extreme of the list). For example, [5,2,2,3] has 1 pair of buddies (the 2’s) , and both 5 and 3 are different than 2, so the function would return 1 in this case. The function would return 0 if the list is [2,2,2,3], since there are three 2’s together, and so they are not considered buddies. [4,4,5] and [4,5,5] are considered to have 1 pair of buddies each.

Answer 1

buddies.py - D:/Coding/Python/buddies.py (3.7.4) - O File Edit Format Run Options Window Help def buddies (1): #Variable to store ans ans = 0 #Variable to store continuous equal elements C = 1 #Loop from 1 to len (1) for i in range (1, len (1)): #Check if current element is equal to previous element. if l[i]==1[i-1]: c = c+1 else: #See if there are 2 continous elements. Increment the answer if c==2: ans = ans+1 c = 1 #Check after the iteration if c==2 : ans = ans+1 return ans

OUTPUT

==================== RESTART: D: /Coding/Python/buddies.py >>> buddies ([5,2,2,3]) >>> buddies ([2,2,2,3]) >>> buddies ( [4,4,5]). >>> buddies ( [4,5,5]) >>>

CODE :

def buddies(l):
#Variable to store ans
ans = 0
#Variable to store continuous equal elements
c = 1
#Loop from 1 to len(l)
for i in range(1,len(l)):
#Check if current element is equal to previous element.
if l[i]==l[i-1]:
c = c+1
else:
#See if there are 2 continous elements. Increment the answer
if c==2:
ans = ans+1
c = 1
#Check after the iteration
if c==2:
ans = ans+1
return ans