Compilare: main.cpp: In function 'void dfs(int)': main.cpp:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[x].size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:49:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol.size()==n) ~~~~~~~~~~^~~ main.cpp:52:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();i++) ~^~~~~~~~~~~