mare.cpp: In function 'int comp(nrmare, nrmare)': mare.cpp:14: warning: comparison between signed and unsigned integer expressions mare.cpp: In function 'int main()': mare.cpp:59: warning: comparison between signed and unsigned integer expressions mare.cpp:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result mare.cpp:47: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result mare.cpp:48: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result mare.cpp:50: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result