Compilare: main.cpp: In function 'void solve()': main.cpp:209:12: warning: variable 'b' set but not used [-Wunused-but-set-variable] int n, b; ^ main.cpp:211:12: warning: unused variable 'j' [-Wunused-variable] int i, j, v[maxn]; ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:18:29: 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); ^ main.cpp: In member function 'int arbib::query2(int)': main.cpp:199:5: warning: control reaches end of non-void function [-Wreturn-type] } ^