Compilare: main.cpp: In function 'bool vef(std::__cxx11::string, std::__cxx11::string)': main.cpp:26:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a.size(); i++ ) ~^~~~~~~~~ main.cpp:34:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return j==b.size(); ~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:78:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(t[i].sc.size()!=sz) ~~~~~~~~~~~~~~^~~~