Compilare: main.cpp: In function 'int main()': main.cpp:128:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("nambartiori.in" , "r" , stdin); ^ main.cpp:129:46: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("nambartiori.out" , "w" , stdout); ^ main.cpp:139:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld" , &t); ^ main.cpp:142:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld" , &n , &k); ^ main.cpp:133:14: warning: iteration 31622 invokes undefined behavior [-Waggressive-loop-optimizations] p[i] = euler(i); ~~~~~^~~~~~~~~~ main.cpp:132:19: note: within this loop for(i = 1 ; i <= lim ; i ++) ~~^~~~~~ main.cpp: In function 'll bs1()': main.cpp:83:19: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] return last + 1; ^ main.cpp: In function 'll bs2()': main.cpp:115:12: warning: 'last' may be used uninitialized in this function [-Wmaybe-uninitialized] return last; ^~~~