Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:18:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp:24:15: 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:41:15: warning: unused variable 'a' [-Wunused-variable] int n,i,j,a; ^