insule.cpp: In function 'void read()': insule.cpp:98: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result insule.cpp:102: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result insule.cpp:114: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result insule.cpp: In function 'int main()': insule.cpp:126: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result insule.cpp:127: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result