rj.cpp: In function 'void read()': rj.cpp:18: warning: format '%c' expects type 'char*', but argument 4 has type 'int*' rj.cpp:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result rj.cpp:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result rj.cpp:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result rj.cpp: In function 'void check()': rj.cpp:74: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result rj.cpp:75: warning: 'X' may be used uninitialized in this function rj.cpp:75: warning: 'Y' may be used uninitialized in this function