Compilare: main.cpp: In function 'void ciur()': main.cpp:22:17: warning: iteration 49998 invokes undefined behavior [-Waggressive-loop-optimizations] if (!c[i]) ~~~^ main.cpp:21:23: note: within this loop for (int i = 2; i <= 50000; ++i) ~~^~~~~~~~ main.cpp:14:14: warning: iteration 24998 invokes undefined behavior [-Waggressive-loop-optimizations] c[i] = 1; ~~~~~^~~ main.cpp:13:23: note: within this loop for (int i = 4; i <= 50000; i += 2) ~~^~~~~~~~ main.cpp: In function 'int main()': main.cpp:70:20: warning: 'rez' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << rez << " " << max << " " << c; ^~~ main.cpp:70:42: warning: 'c' may be used uninitialized in this function [-Wmaybe-uninitialized] fout << rez << " " << max << " " << c; ^