Compilare: user.cpp: In function ‘int dist(int, int)’: user.cpp:107:9: warning: variable ‘qw’ set but not used [-Wunused-but-set-variable] bla qw = col[p1], wq = lin[p2]; ^ user.cpp:107:23: warning: variable ‘wq’ set but not used [-Wunused-but-set-variable] bla qw = col[p1], wq = lin[p2]; ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:17:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^