Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:25:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<graf[element].size() && !found; i++) ^ user.cpp: In function ‘int main()’: user.cpp:58:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<visited.size() && i<n; i++) ^ user.cpp:45:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y,n,m,c=0; ^