work/source: In function ‘int main()’:
work/source:56: error: ‘strlen’ was not declared in this scope
work/source:79: error: ‘memset’ was not declared in this scope
work/source:50: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result
work/source:51: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result
work/source:53: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result
work/source:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result
