Compilare: main.cpp:8:37: warning: bad option '-f unroll-loops' to pragma 'optimize' [-Wpragmas] 8 | #pragma GCC optimize(" unroll-loops") | ^ main.cpp:16:44: warning: bad option '-f unroll-loops' to attribute 'optimize' [-Wattributes] 16 | void backtrack(int poz,int l,int c,string s){ | ^ main.cpp: In function 'void backtrack(int, int, int, std::string)': main.cpp:20:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int i=0;i+1<s.size();i+=2){ | ~~~^~~~~~~~~ main.cpp:26:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for(int i=0;i<aux1.size();i++){ | ~^~~~~~~~~~~~ main.cpp: At global scope: main.cpp:46:10: warning: bad option '-f unroll-loops' to attribute 'optimize' [-Wattributes] 46 | int main() | ^