Unvisited min = B(350). Current = B. Neighbors: S(no), A(350+150=500 vs 200 no), C(350+180=530 vs 600 → update C=530), D(350+220=570 vs 510 no), E(350+280=630). Visited S,A,B.
Destination T reached (820). Stop.
Unvisited min = D(510). Current = D. Neighbors: A(no), B(no), C(510+120=630 vs 530 no), F(510+300=810), T(510+500=1010). Update T tentative = 1010. Visited S,A,B,D. graph theory math ia
(sort edges by weight, add if no cycle): Unvisited min = B(350)