Compilare: main.cpp: In function 'std::__cxx11::string eval()': main.cpp:26:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind >= sGB.size()) return ""; ~~~~^~~~~~~~~~~~~ main.cpp:65:9: warning: variable 'isF' set but not used [-Wunused-but-set-variable] int isF = 0; ^~~ main.cpp: In function 'int main()': main.cpp:90:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sGB.size();++i) { ~^~~~~~~~~~~ main.cpp: In function 'std::__cxx11::string eval()': main.cpp:83:1: warning: control reaches end of non-void function [-Wreturn-type] } ^