Compilare: main.cpp: In function 'void processSol(char, char, std::vector<std::__cxx11::basic_string<char> >&, std::vector<Operation>&)': main.cpp:93:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<solc.size(); ++i) sol.push_back(solc[i]); ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:136:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<s1.size(); ++i) cout<<s1[i].d<<" "<<s1[i].v1<<" "<<s1[i].v2<<"\n"; ~^~~~~~~~~~