Compilare: main.cpp: In function 'void bfs1(int)': main.cpp:18:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a[p].size(); i++) { ~~^~~~~~~~~~~~~ main.cpp: In function 'void bfs2(int)': main.cpp:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a[p].size(); i++) { ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:63:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < v.size(); i++) out << v[i] << ' '; ~~^~~~~~~~~~