Compilare: user.cpp: In function ‘void read()’: user.cpp:18:40: warning: format ‘%c’ expects argument of type ‘char*’, but argument 4 has type ‘int*’ [-Wformat=] scanf ( "%d%d%c", &n, &m, &R[1][1] ); ^ user.cpp:17:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "rj.in", "r", stdin ); ^ user.cpp:18:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d%c", &n, &m, &R[1][1] ); ^ user.cpp:23:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%c", &w ); ^ user.cpp: In function ‘void check()’: user.cpp:91:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "rj.out", "w", stdout ); ^