Compilare: main.cpp:3: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas] 3 | #pragma GCC optimization ("O3") | main.cpp:4: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas] 4 | #pragma GCC optimization ("unroll-loops") | main.cpp: In function 'void ciur1()': main.cpp:22:14: warning: iteration 1000000 invokes undefined behavior [-Waggressive-loop-optimizations] 22 | if (!p1[i]) { | ~~~~^ main.cpp:21:21: note: within this loop 21 | for (int i = 2; i <= M; i++) | ~~^~~~ main.cpp: In function 'void ciur2()': main.cpp:35:12: warning: iteration 1000000 invokes undefined behavior [-Waggressive-loop-optimizations] 35 | if (f[i]) { | ~~~^ main.cpp:34:20: note: within this loop 34 | for (int i= 2; i <= M; i++) { | ~~^~~~