Compilare: user.cpp: In function ‘void getPrimeNumbers(int&)’: user.cpp:14:22: warning: iteration 39998u invokes undefined behavior [-Waggressive-loop-optimizations] viz[i] = true; ^ user.cpp:13:22: note: containing loop for(int i = 4; i <= maxPrimNumbers; i += 2) { ^ user.cpp: In function ‘int getMagicValue(int, int, int)’: user.cpp:38:12: warning: ‘ans’ may be used uninitialized in this function [-Wmaybe-uninitialized] return ans; ^ user.cpp: In function ‘int main()’: user.cpp:56:45: warning: ‘ans’ may be used uninitialized in this function [-Wmaybe-uninitialized] sum += getMagicValue(nr, k, cnt); ^ user.cpp:51:40: warning: ‘ans’ may be used uninitialized in this function [-Wmaybe-uninitialized] out << getMagicValue(nr, k, cnt) << '\n'; ^