Compilare: main.cpp: In function 'int main()': main.cpp:26:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();++i) ~^~~~~~~~~ main.cpp:27:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[i]==a.size()) main.cpp:34:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();++i) ~^~~~~~~~~~~