Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:20:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:67:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<sol.size();i++) ~^~~~~~~~~~~ main.cpp:46:11: warning: unused variable 'j' [-Wunused-variable] int i,j,x,y; ^