Compilare: main.cpp: In function 'int main()': main.cpp:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<n.size(); i++) ~^~~~~~~~~ main.cpp:62:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<n.size(); i++) ~^~~~~~~~~ main.cpp:68:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(l=i+1; l<n.size(); l++)t=t*(w[n[l]-'0']); ~^~~~~~~~~