Compilare: main.cpp: In function 'int ecuation_solver(std::__cxx11::string, std::vector<int>)': main.cpp:84:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<formula.length();++i){ ~^~~~~~~~~~~~~~~~~ main.cpp:102:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<signs.size();++i){ ~^~~~~~~~~~~~~ main.cpp:111:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<signs.size();++i){ ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:192:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1;j<=v.size();++j){ ~^~~~~~~~~~