Compilare: main.cpp: In function 'void BFS1()': main.cpp:22:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<edge[node].size(); i++){ ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'void BFS2()': main.cpp:42:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<edge[node].size(); i++){ ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:101:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<ans.size(); i++) ~^~~~~~~~~~~