Compilare: main.cpp: In function 'void bfs()': main.cpp:23:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < liste[top].size(); ++i) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp: In function 'bool alreadyExists(int, int, int&, int&)': main.cpp:45:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < liste[a].size(); ++i) ~~^~~~~~~~~~~~~~~~~ main.cpp:48:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < liste[b].size(); ++j) if (liste[b][j].first == a) index2 = j; ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:82:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (liste[i].size() == minGrad) ~~~~~~~~~~~~~~~~^~~~~~~~~~