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set.go
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set.go
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package set
import (
"fmt"
"strings"
)
var (
keyExist = struct{}{}
)
const maxInt = int(^uint(0) >> 1)
type Set[T comparable] struct {
m map[T]struct{}
}
func New[T comparable](ts ...T) *Set[T] {
s := &Set[T]{make(map[T]struct{}, len(ts))}
s.Add(ts...)
return s
}
func (s *Set[T]) Add(items ...T) {
for _, item := range items {
s.m[item] = keyExist
}
}
func (s *Set[T]) Remove(items ...T) {
for _, item := range items {
delete(s.m, item)
}
}
func (s *Set[T]) Pop() T {
var nonExistence = new(T)
for item := range s.m {
delete(s.m, item)
return item
}
return *nonExistence
}
func (s *Set[T]) Pop2() (T, bool) {
var nonExistence = new(T)
for item := range s.m {
delete(s.m, item)
return item, true
}
return *nonExistence, false
}
func (s *Set[T]) Has(items ...T) bool {
has := false
for _, item := range items {
// Note: trick: has will override the initial value of has(false)
if _, has = s.m[item]; !has {
break
}
}
return has
}
func (s *Set[T]) HasAny(items ...T) bool {
has := false
for _, item := range items {
if _, has = s.m[item]; has {
break
}
}
return has
}
func (s *Set[T]) Size() int {
return len(s.m)
}
func (s *Set[T]) Clear() {
s.m = make(map[T]struct{})
}
func (s *Set[T]) IsEmpty() bool {
return s.Size() == 0
}
func (s *Set[T]) IsEqual(t *Set[T]) bool {
if s.Size() != t.Size() {
return false
}
eq := true
s.Each(func(item T) bool {
_, eq = t.m[item]
return eq
})
return eq
}
func (s *Set[T]) IsSubset(t *Set[T]) bool {
if s.Size() < t.Size() {
return false
}
subset := true
t.Each(func(item T) bool {
_, subset = s.m[item]
return subset
})
return subset
}
func (s *Set[T]) IsSuperset(t *Set[T]) bool {
return t.IsSubset(s)
}
func (s *Set[T]) Each(f func(item T) bool) {
for item := range s.m {
if !f(item) {
break
}
}
}
func (s *Set[T]) Copy() *Set[T] {
newSet := &Set[T]{make(map[T]struct{}, s.Size())}
s.Each(func(item T) bool {
newSet.Add(item)
return true
})
return newSet
}
func (s *Set[T]) String() string {
v := make([]string, 0, s.Size())
for item := range s.m {
v = append(v, fmt.Sprintf("%v", item))
}
return fmt.Sprintf("[%s]", strings.Join(v, ", "))
}
func (s *Set[T]) List() []T {
res := make([]T, 0, s.Size())
s.Each(func(item T) bool {
res = append(res, item)
return true
})
return res
}
func (s *Set[T]) Merge(t *Set[T]) {
for item := range t.m {
s.m[item] = keyExist
}
}
func (s *Set[T]) Separate(t *Set[T]) {
for item := range t.m {
delete(s.m, item)
}
}
func Union[T comparable](sets ...*Set[T]) *Set[T] {
maxPos := -1
maxSize := 0
for i, set := range sets {
if l := set.Size(); l > maxSize {
maxSize = l
maxPos = i
}
}
if maxSize == 0 {
return &Set[T]{}
}
u := sets[maxPos].Copy()
for i, set := range sets {
if i == maxPos {
continue
}
for item := range set.m {
u.m[item] = keyExist
}
}
return u
}
func Difference[T comparable](s1 *Set[T], sets ...*Set[T]) *Set[T] {
s := s1.Copy()
for _, set := range sets {
s.Separate(set)
}
return s
}
func Intersection[T comparable](sets ...*Set[T]) *Set[T] {
minPos := -1
minSize := maxInt
for i, set := range sets {
if l := set.Size(); l < minSize {
minSize = l
minPos = i
}
}
if minSize == maxInt || minSize == 0 {
return &Set[T]{}
}
t := sets[minPos].Copy()
for i, set := range sets {
if i == minPos {
continue
}
for item := range t.m {
if _, has := set.m[item]; !has {
delete(t.m, item)
}
}
}
return t
}
func SymmetricDifference[T comparable](s *Set[T], t *Set[T]) *Set[T] {
u := Difference(s, t)
v := Difference(t, s)
return Union(u, v)
}