Prim algorithm visualization

[kaxap]

In Prim algo description on visual example's step #7 shouldn't the blue table have H=8 instead of H=∞?

[cch123]

Plus an unrelated question..what is the tool used to draw this picture?

[kaxap]

@cch123 draw.io probably

[cch123]

@kaxap , thx very much~