题解 | 【模板】序列操作

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void async function () {
    // Write your code here
    let count = 0;
    const arr = [];
    while(line = await readline()){
        if(count > 0){
            let tokens = line.split(' ');
            let a = parseInt(tokens[0]);
            let b = parseInt(tokens[1]);
            let c = parseInt(tokens[2]);
            if(a === 1) arr.push(b);
            if(a === 2) arr.pop();
            if(a === 3) console.log(arr[b]);
            if(a === 4) arr.splice(b+1, 0, c);
            if(a === 5) arr.sort((p,q)=>p-q);
            if(a === 6) arr.sort((p,q)=>q-p);
            if(a === 7) console.log(arr.length);
            if(a === 8) console.log(arr.join(' '));
        }
        count++
    }
}()