Compilare: main.cpp: In function 'void bfs()': main.cpp:29:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<t; i++) ~^~ main.cpp: In function 'int main()': main.cpp:40:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=n-1; i++) ~^~~~~ main.cpp:49:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=1; j<=maxi; j++) ~^~~~~~