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
    const tab = {
        '0': 0,
        '1': 1,
        '2': 2,
        '3': 3,
        '4': 4,
        '5': 5,
        '6': 6,
        '7': 7,
        '8': 8,
        '9': 9,
        'A': 10,
        'B': 11,
        'C': 12,
        'D': 13,
        'E': 14,
        'F': 15,
    };
    while(line = await readline()){
        if (line.startsWith('0x') && line.length > 2) {
            let tokens = line.split('');
            let sum = 0;
            for (let i = tokens.length - 1, j = 0; i > 1; i--, j++) {
                sum += tab[tokens[i]] * Math.pow(16, j);
            }
            console.log(sum);
        }
    }
}()