otilia.cpp: In function 'void read()': otilia.cpp:25: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result otilia.cpp:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result otilia.cpp:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result otilia.cpp: In function 'void solve()': otilia.cpp:86: warning: unused variable 'j' otilia.cpp: In function 'void write()': otilia.cpp:99: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result