Compilare: main.cpp: In function 'void DFS(int, int, int)': main.cpp:50:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < adj[n].size() ; i++) ~~^~~~~~~~~~~~~~~ main.cpp: In function 'void print_out()': main.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < C.size(); ++ i) ~~^~~~~~~~~~ main.cpp:79:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < C[i].size(); ++ j) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:91:15: warning: 'n' is used uninitialized in this function [-Wuninitialized] idx.resize(n), lowlink.resize(n); ~~~~~~~~~~^~~