Compilare: main.cpp:3:56: warning: bad option '-f O2' to pragma 'optimize' [-Wpragmas] 3 | #pragma GCC optimize ("O1, O2, O3, Ofast, unroll-loops") | ^ main.cpp:3:56: warning: bad option '-f O3' to pragma 'optimize' [-Wpragmas] main.cpp:3:56: warning: bad option '-f Ofast' to pragma 'optimize' [-Wpragmas] main.cpp:3:56: warning: bad option '-f unroll-loops' to pragma 'optimize' [-Wpragmas] main.cpp:13:10: warning: bad option '-f O2' to attribute 'optimize' [-Wattributes] 13 | int main() | ^ main.cpp:13:10: warning: bad option '-f O3' to attribute 'optimize' [-Wattributes] main.cpp:13:10: warning: bad option '-f Ofast' to attribute 'optimize' [-Wattributes] main.cpp:13:10: warning: bad option '-f unroll-loops' to attribute 'optimize' [-Wattributes]