golang：使用set求数组的交集、差集、并集

先获取set包

go get -u gopkg.in/fatih/set.v0

如下演示set并集，交集，差集的计算

package main

import (
    "fmt"
    "gopkg.in/fatih/set.v0"
)

/*set并集 交集 差集计算示例*/
func main() {
    a := set.New(set.ThreadSafe)
    a.Add(1)
    a.Add(2)
    a.Add(3)

    b := set.New(set.ThreadSafe)
    b.Add(2)
    b.Add(3)
    b.Add(4)

    //并集
    unionSet := set.Union(a, b)
    fmt.Printf("并集:%v\n", unionSet)

    //交集
    intersectionSet := set.Intersection(a, b)
    fmt.Printf("交集:%v\n", intersectionSet)

    //差集
    diffS1S2 := set.Difference(a, b)
    fmt.Printf("差集(属a不属b):%v\n", diffS1S2)

    diffS2S1 := set.Difference(b, a)
    fmt.Printf("差集(属b不属a):%v\n", diffS2S1)
}

输出 :

并集:[4, 1, 2, 3]
交集:[2, 3]
差集(属a不属b):[1]
差集(属b不属a):[4]

go get -u github.com/deckarep/golang-set