Compilare: main.cpp: In function 'void DFS(int, int)': main.cpp:16:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < Edges[vertex].size(); ++j) ~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:69:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < Edges[edge.first].size(); ++j) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:79:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < Edges[edge.second].size(); ++j) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~