work/source: In function ‘int main()’:
work/source:74: error: ‘sort’ was not declared in this scope
work/source:61: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result
work/source:62: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result
work/source:64: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result
work/source:66: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result
work/source:69: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result
