Done PR

Problem1.py

@@ -0,0 +1,9 @@
+import pandas as pd
+
+def nth_highest_salary(employee: pd.DataFrame, N: int) -> pd.DataFrame:
+    colname = f'getNthHighestSalary({N})'
+    array_values = sorted(employee['salary'].unique(), reverse = True)
+    if N >= 1 and len(array_values) >= N :
+        return pd.DataFrame({colname: [array_values[N-1]]})
+
+    return pd.DataFrame({colname: [None]})

Problem2.py

@@ -0,0 +1,12 @@
+import pandas as pd
+
+def second_highest_salary(employee: pd.DataFrame) -> pd.DataFrame:
+    unique_salaries = employee['salary'].drop_duplicates()
+
+    if len(unique_salaries) >= 2:
+        second_highest = unique_salaries.nlargest(2).iloc[-1]
+    else:
+        second_highest = None
+
+    result_df = pd.DataFrame({'SecondHighestSalary': [second_highest]})
+    return result_df