【模板】循环队列

var opr=readline().split(" ");
var queue = [];
for(let i =0 ; i < parseInt(opr[1]);i++)
    {        
        let ls = readline().split(" ");
        if(ls.length == 2 && queue.length < parseInt(opr[0]))
            {           
                queue.push(ls[1]);                                 
            }
        else if(ls.length == 2 && queue.length == parseInt(opr[0]))
        {
            console.log("full");
        }
        else 
            {
                if (ls[0] == 'front' && queue.length >0 ) console.log(queue[0]);
                else if(ls[0] == 'pop' && queue.length >0 ) console.log(queue.shift());
                else if(queue.length == 0 ) console.log("empty");
            }
        
           
    }