rsp.cpp: In function 'int main()': rsp.cpp:132: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result rsp.cpp:133: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result rsp.cpp:136: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result rsp.cpp:138: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result