Compilare: main.cpp: In function 'void bfs2(int, int)': main.cpp:33:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[u].size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'bool bfs(int, int)': main.cpp:62:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[u].size(); i++) ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:109:9: warning: unused variable 'ok' [-Wunused-variable] int ok=1; ^~ main.cpp:123:19: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized] d_out[x]+=t; ^