Compilare: main.cpp: In function 'void BFS1()': main.cpp:36:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a[q.front()].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void BFS2()': main.cpp:54:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a[q.front()].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:76:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < aux.size(); i++) ~~^~~~~~~~~~~~ main.cpp:78:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < aux.size(); i++) ~~^~~~~~~~~~~~ main.cpp:82:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sol.size(); i++) ~~^~~~~~~~~~~~