My 30th Problem (pd)
ApproachSimply use pd.concat() built-in function.Complexity
Time complexity: O(n)

Space complexity: O(n) cause th enew DataFrame requires additional space.
Cod
# Approach
<!-- Describe your approach to solving the problem. -->
Simply use pd.concat() built-in function.
# Complexity
- Time complexity: $$O(n)$$
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity: $$O(n)$$ cause th enew DataFrame requires additional space.
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```pythondata []
import pandas as pd

def concatenateTables(df1: pd.DataFrame, df2: pd.DataFrame) -> pd.DataFrame:
    return pd.concat([df1,df2])
```
['Pandas']