// Create a new disjoint-set
d := dsu.New()
// Add the elements 1, 2, 3 to the set
d.Add(1)
d.Add(2)
d.Add(3)
// The set is now {1}, {2}, {3}
// Unite the sets {1}, {2} 
d.Union(1, 2)
// The set is now {1, 2}, {3}
// Find the representative element of each set
d.Find(1) // returns 2
d.Find(2) // returns 2
d.Find(3) // returns 3
// Check the existence of an element in the set
d.Contains(2) // returns true
d.Contains(54) // returns false
// Note : you can add elements of different type in the set
// Example
d.Add("hello")
d.Add(34.5)
d.Union("hello", 34.5)