Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:27:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<graph[element].size()&&!found;i++) ^ user.cpp: In function ‘int main()’: user.cpp:65:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<visited.size()&&i<n;i++) ^ user.cpp:64:12: warning: unused variable ‘k’ [-Wunused-variable] int k=0; ^