Compilare: main.cpp: In function 'int main()': main.cpp:31:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=a.size()+1;i<s.size();++i) ~^~~~~~~~~ main.cpp:32:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v[i]==a.size()) main.cpp:39:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();++i) ~^~~~~~~~~~~