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@@ -0,0 +1,62 @@
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+package main
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+
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+import "fmt"
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+
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+type disjointSet struct {
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+ par []int
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+ rank []int
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+}
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+
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+func newDisjointSet(n int) disjointSet {
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+ ds := disjointSet{make([]int, n), make([]int, n)}
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+ for i := range ds.par {
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+ ds.par[i] = i
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+ }
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+ return ds
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+}
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+
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+func (ds disjointSet) find(i int) int {
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+ if ds.par[i] == i {
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+ return i
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+ }
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+ pa := ds.find(ds.par[i])
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+ ds.par[i] = pa
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+ return pa
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+}
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+
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+func (ds disjointSet) isConnected(i, j int) bool {
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+ return ds.find(i) == ds.find(j)
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+}
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+
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+func (ds disjointSet) union(i, j int) bool {
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+ i, j = ds.find(i), ds.find(j)
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+ if i == j {
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+ return false
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+ }
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+ if ds.rank[i] < ds.rank[j] {
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+ ds.par[i] = j
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+ } else {
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+ if ds.rank[i] == ds.rank[j] {
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+ ds.rank[i]++
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+ }
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+ ds.par[j] = i
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+ }
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+ return true
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+}
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+
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+func main() {
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+ var n int
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+ fmt.Print("Number of connections: ")
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+ fmt.Scan(&n)
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+ ds := newDisjointSet(n)
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+ for i := 1; i <= n; i++ {
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+ var x, y int
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+ fmt.Printf("No.%d connection: ", i)
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+ fmt.Scan(&x, &y)
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+ ds.union(x, y)
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+ }
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+ fmt.Print("Check connection: ")
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+ var x, y int
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+ fmt.Scan(&x, &y)
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+ fmt.Println(ds.isConnected(x, y))
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+}
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