work/source: In function ‘int main(int, char**)’:
work/source:97: error: ‘stdin’ was not declared in this scope
work/source:97: error: ‘freopen’ was not declared in this scope
work/source:98: error: ‘stdout’ was not declared in this scope
work/source:100: error: ‘scanf’ was not declared in this scope
work/source:103: error: ‘sort’ was not declared in this scope
work/source:107: error: ‘printf’ was not declared in this scope
