Merge pull request #143 from SepidehHosseinian/1050.-Actors-and-Direc…

…tors-Who-Cooperated-At-Least-Three-Times

1050.Actors and Directors Who Cooperated

DataBase/Pandas/1050_ActorsandDirectorsWhoCooperatedAtLeastThreeTimes/description.md

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+### 1050. Actors and Directors Who Cooperated At Least Three Times
+|Easy
+
+Table: ActorDirector
+```
++-------------+---------+
+| Column Name | Type    |
++-------------+---------+
+| actor_id    | int     |
+| director_id | int     |
+| timestamp   | int     |
++-------------+---------+
+```
+timestamp is the primary key (column with unique values) for this table.
+
+
+Write a solution to find all the pairs (actor_id, director_id) where the actor has cooperated with the director at least three times.
+
+Return the result table in any order.
+
+The result format is in the following example.
+
+
+
+Example 1:
+```
+Input: 
+ActorDirector table:
++-------------+-------------+-------------+
+| actor_id    | director_id | timestamp   |
++-------------+-------------+-------------+
+| 1           | 1           | 0           |
+| 1           | 1           | 1           |
+| 1           | 1           | 2           |
+| 1           | 2           | 3           |
+| 1           | 2           | 4           |
+| 2           | 1           | 5           |
+| 2           | 1           | 6           |
++-------------+-------------+-------------+
+Output: 
++-------------+-------------+
+| actor_id    | director_id |
++-------------+-------------+
+| 1           | 1           |
++-------------+-------------+
+Explanation: The only pair is (1, 1) where they cooperated exactly 3 times.
+```

DataBase/Pandas/1050_ActorsandDirectorsWhoCooperatedAtLeastThreeTimes/solution.py

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+import pandas as pd
+
+def actors_and_directors(actor_director: pd.DataFrame) -> pd.DataFrame:
+    stats = actor_director.groupby(
+        ['actor_id', 'director_id'],
+    ).agg(
+        count=('director_id', 'count'),
+    ).reset_index()
+    return stats[stats['count'] >= 3][['actor_id', 'director_id']]