Compilare: main.cpp: In member function 'void Graph::printData()': main.cpp:80:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < ans.size(); ++j) { ~~^~~~~~~~~~~~ main.cpp:82:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ans[j].size(); ++i) { ~~^~~~~~~~~~~~~~~ main.cpp:84:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i + 1 != ans[j].size()) ~~~~~~^~~~~~~~~~~~~~~~ main.cpp:87:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j + 1 != ans.size()) ~~~~~~^~~~~~~~~~~~~