Friendship Timeline
Start Timer
0:00:00
There are two lists of dictionaries representing friendship beginnings and endings: friends_added
and friends_removed
. Each dictionary contains the user_ids
and created_at
time of the friendship beginning /ending.
Write a function friendship_timeline
to generate an output that lists the pairs of friends with their corresponding timestamps of the friendship beginning and then the timestamp of the friendship ending.
Note: There can be multiple instances over time when two people became friends and unfriended; only output lists when a corresponding friendship was removed.
Example:
Input:
friends_added = [
{'user_ids': [1, 2], 'created_at': '2020-01-01'},
{'user_ids': [3, 2], 'created_at': '2020-01-02'},
{'user_ids': [2, 1], 'created_at': '2020-02-02'},
{'user_ids': [4, 1], 'created_at': '2020-02-02'}]
friends_removed = [
{'user_ids': [2, 1], 'created_at': '2020-01-03'},
{'user_ids': [2, 3], 'created_at': '2020-01-05'},
{'user_ids': [1, 2], 'created_at': '2020-02-05'}]
Output:
friendships = [{
'user_ids': [1, 2],
'start_date': '2020-01-01',
'end_date': '2020-01-03'
},
{
'user_ids': [1, 2],
'start_date': '2020-02-02',
'end_date': '2020-02-05'
},
{
'user_ids': [2, 3],
'start_date': '2020-01-02',
'end_date': '2020-01-05'
},
]
Recommended questions for you
Personalized based on your user activity, skill level, and preferences.
.
.
.
.
.
.
.
.
.
Comments