work/source: In function ‘int main()’:
work/source:75: error: ‘stdin’ was not declared in this scope
work/source:75: error: ‘freopen’ was not declared in this scope
work/source:76: error: ‘stdout’ was not declared in this scope
work/source:79: error: ‘scanf’ was not declared in this scope
work/source:88: error: ‘memset’ was not declared in this scope
work/source:116: error: ‘printf’ was not declared in this scope
