题解 | 进制转换

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});
rl.on('line', function (line) {
    const map = {
        'A': 10,
        "B": 11,
        "C": 12,
        "D": 13,
        "E": 14,
        "F": 15
    }
    let result = 0;
    let index = line.length - 1;
    while(index >= 2) {
        let x = line[index]
        let num = Number(map[x] || x)
        result += num * (16 ** (line.length - 1 - index))
        index--
    }
    console.log(result)
});