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go back to delete in removeVertex

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This commit is contained in:
Josh Deprez 2021-09-24 12:27:34 +10:00
parent 0d5fc2520c
commit 1a26a2e516
1 changed files with 3 additions and 2 deletions
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5
engine/drawdag.go
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@ -350,10 +350,10 @@ func (d dag) addVertex(v Drawer) {
// removeVertex removes all in and out edges associated with v in O(degree(v)).
func (d dag) removeVertex(v Drawer) {
for u := range d[v].in {
d.removeEdge(u, v)
delete(d[u].out, v)
}
for w := range d[v].out {
d.removeEdge(v, w)
delete(d[w].in, v)
}
delete(d, v)
}
@ -367,6 +367,7 @@ func (d dag) addEdge(u, v Drawer) {
}
// removeEdge removes the edge (u -> v) in O(1).
//lint:ignore U1000 this exists for symmetry with addEdge
func (d dag) removeEdge(u, v Drawer) {
delete(d[v].in, u)
delete(d[u].out, v)