golang-解题标准括号问题

·解题思路来源 https://github.com/azl3979858…

package main

import "container/list"
import "fmt"

func main(){s := "{{}}"
    m := "{{[()}]}"
    l := "{[(())]}"

    fmt.Println(check(s))
    fmt.Println(check(m))
    fmt.Println(check(l))
}

func check(x string) bool {mapper := map[byte]byte{'{':'}',
        '(':')',
        '[':']',
    }

    stack := list.New() // 初始化栈

    for _, v := range x {i := byte(v)
        if _, ok := mapper[i]; ok {
            // 入栈
            stack.PushFront(i)
            fmt.Println(i)
        } else {if stack.Len() == 0 {return false}
            l := stack.Remove(stack.Front()).(byte)
            r, ok := mapper[l]
            if !ok || r != i {return false}
            fmt.Printf("%s:%s", "S", string(i))
            fmt.Printf("%s:%s", "L", string(l))
            fmt.Printf("%s:%s", "R", string(r))
            fmt.Println()}
    }
    if stack.Len() > 0 {return false}
    return true
}