Please write a testcase for the function '{func_name}' given the following program under test and function description. Your answer should only contain one test input.

Program under test:
```cpp
{program}
```

Function description for '{func_name}':
```txt
{description}
```

You can directly use `assert` function for assertion. Your testcase should be formatted as:
```cpp
int main() {{
    Solution solution;
}}
```
