Added solution of problem 184

Author: kurpenok

src/solutions/s0184_department_highest_salary.py

@@ -0,0 +1,23 @@
+import pandas as pd
+
+
+def department_highest_salary(
+    employee: pd.DataFrame, department: pd.DataFrame
+) -> pd.DataFrame:
+    merged = employee.merge(
+        department, left_on="departmentId", right_on="id", how="left"
+    )
+
+    highest_salary = merged.loc[
+        merged.groupby("departmentId")["salary"].transform("max") == merged["salary"]
+    ]
+
+    result = highest_salary[["name_x", "salary", "name_y"]].rename(
+        columns={
+            "name_y": "Department",
+            "name_x": "Employee",
+            "salary": "Salary",
+        }
+    )
+
+    return result[["Department", "Employee", "Salary"]]