Compilare: main.cpp:1:47: warning: bad option '-f Ofast' to pragma 'optimize' [-Wpragmas] 1 | #pragma GCC optimize("O3, Ofast, unroll-loops") | ^ main.cpp:1:47: warning: bad option '-f unroll-loops' to pragma 'optimize' [-Wpragmas] main.cpp:8:10: warning: bad option '-f Ofast' to attribute 'optimize' [-Wattributes] 8 | int main() | ^ main.cpp:8:10: warning: bad option '-f unroll-loops' to attribute 'optimize' [-Wattributes] main.cpp: In function 'int main()': main.cpp:27:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | for(int j=l; j<s2.size(); j++) | ~^~~~~~~~~~