Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:26:40: 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:63:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<visited.size()&&i<n;i++) ^