Compilare: main.cpp: In function 'int main()': main.cpp:21:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<s.size(); i++) ~^~~~~~~~~ main.cpp:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=n; i<s.size(); i++) ~^~~~~~~~~ main.cpp:34:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<sol.size(); i++) g << sol[i] << ' '; ~^~~~~~~~~~~