//
// frontier = copath from the last leaf + 1
//
frontier = copath from the last leaf + 1
// // frontier = copath from the last leaf + 1 //
func (lbt *LeftBalancedTree) Construct(frontier []interface{}, size int) {
	if len(frontier) > 0 {
		lbt.root = setFrontier(frontier, size)
	}
}
func ( lbt * LeftBalancedTree ) Construct ( frontier [ ] interface { } , size int ) { if len ( frontier ) > 0 { lbt . root = setFrontier ( frontier , size ) } }
frontier = copath from the last leaf + 1
frontier = copath from the last leaf + 1