Compilare: user.cpp: In function ‘void remove(int)’: user.cpp:25:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < Hash [ value ] . size () ; i ++ ) ^ user.cpp: In function ‘int isIn(int)’: user.cpp:33:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0 ; i < Hash [ value ] . size () ; i ++ ) ^ user.cpp: In function ‘void read()’: user.cpp:41:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf ( f , "%d" , &N ); ^ user.cpp:44:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf ( f , "%d %d" , &type , &request ); ^