Compilare: main.cpp:2:0: warning: ignoring #pragma optimize [-Wunknown-pragmas] #pragma optimize("O2") main.cpp: In function 'int main()': main.cpp:14:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ main.cpp: In function 'int ask(int)': main.cpp:8:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &ans); ^