Compilare: user.cpp: In function ‘int read()’: user.cpp:15:18: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[8]’ [-Wformat=] scanf("%s",&c); ^ user.cpp: In function ‘void open()’: user.cpp:9:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rmq.in","r",stdin); ^ user.cpp:10:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rmq.out","w",stdout); ^ user.cpp: In function ‘int read()’: user.cpp:15:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",&c); ^