Compilare: main.cpp:2: warning: ignoring '#pragma gcc optimize' [-Wunknown-pragmas] 2 | #pragma gcc optimize("Ofast") | main.cpp:3: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas] 3 | #pragma GCC optimization("Ofast") | main.cpp:4: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas] 4 | #pragma optimize(Ofast) | main.cpp:1:37: warning: bad option '-f unroll-loops' to pragma 'optimize' [-Wpragmas] 1 | #pragma GCC optimize(" unroll-loops") | ^ main.cpp:22:10: warning: bad option '-f unroll-loops' to attribute 'optimize' [-Wattributes] 22 | int main() | ^