harta2.cpp: In function 'int main()': harta2.cpp:40: warning: comparison between signed and unsigned integer expressions harta2.cpp:21: warning: unused variable 'h' harta2.cpp:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result harta2.cpp:20: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result harta2.cpp:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result harta2.cpp:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result harta2.cpp:48: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result harta2.cpp:26: warning: 'ret' may be used uninitialized in this function