Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:23:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i<=graph[element].size() && !found; i++) ^ user.cpp: In function ‘int main()’: user.cpp:47:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i<=visited.size(); i++) ^