harta.cpp: In function 'int main()': harta.cpp:197: warning: unused variable 'j' harta.cpp:195: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result harta.cpp:196: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result harta.cpp:198: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result harta.cpp:208: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result