题解 | 【模板】队列

package main

import (
    "fmt"
    "container/list"
)

func main() {
    n:=0
    fmt.Scan(&n)
    queue:=list.New()
    for i:=0;i<n;i++{
        var op string;
        fmt.Scan(&op)
        if op == "push"{
            var num int;
            fmt.Scan(&num)
            queue.PushBack(num)
        }else if (queue.Len() == 0){
            fmt.Println("error")
        }else if op == "pop" {
            tmp:=queue.Front()
            fmt.Println(tmp.Value)
            queue.Remove(tmp)
        }else if op == "front" {
            tmp:=queue.Front()
            fmt.Println(tmp.Value)
        }
    }
    return 
}