题解 | #进制转换#

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 str=await readline();
    str=str.slice(2)
    const n=str.length;
    let res=0
    for(let i=0;i<n;i++)
    {
        const carry=n-i-1;
        const code=str.charCodeAt(i)
        let num=0
        if(code<65)
        {
             num=code-48
        }else{
            num=code-65+10
        }
        res+= num*Math.pow(16,carry)
    }
    console.log(res)
}()