Compilare: main.cpp:2:0: warning: ignoring #pragma gcc optimize [-Wunknown-pragmas] #pragma gcc optimize("O3") main.cpp: In function 'int update(int, int)': main.cpp:37:12: warning: statement has no effect [-Wunused-value] for (pos / 2; pos >= 1; pos /= 2) ~~~~^~~ main.cpp:39:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^