Compilare: user.cpp: In function ‘int bfs()’: user.cpp:26:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=l[x][0]; i++) ^ user.cpp:27:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(!viz[l[x][i]] && di[x][l[x][i]]<=d[1]) ^ user.cpp: In function ‘int main()’: user.cpp:54:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(dist<di[a][b])di[a][b]=di[b][a]=dist; ^ user.cpp:77:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d[dr]>=di[nod][l[nod][i]]) ^