work/source: In function ‘int main()’:
work/source:25: error: ‘stdin’ was not declared in this scope
work/source:25: error: ‘freopen’ was not declared in this scope
work/source:26: error: ‘stdout’ was not declared in this scope
work/source:28: error: ‘scanf’ was not declared in this scope
work/source:34: error: ‘sort’ was not declared in this scope
work/source:37: error: ‘memset’ was not declared in this scope
work/source:47: error: ‘printf’ was not declared in this scope
