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
    while(line = await readline()){
        let tokens = line.split(' ');
        let a = parseInt(tokens[0]);
        let b = parseInt(tokens[1]);
     
        let sum=0
        let arr1=tokens[0].split('')
        let arr2=[]
        for(let i=0;i<arr1.length;i++){
            arr2.unshift(arr1[i])
        }

         
      for(let i=0;i<arr2.length-2;i++){
        switch(arr2[i]){
            case "A":
                sum+=10*Math.pow(16,i)
                break
            case "B":
                sum+=11*Math.pow(16,i)
                break
            case "C":
                sum+=12*Math.pow(16,i)
                break
            case "D":
                sum+=13*Math.pow(16,i)
                break
            case "E":
                sum+=14*Math.pow(16,i)
                break
             case "F":
                sum+=15*Math.pow(16,i)
                break
            default:
                sum+=arr2[i]*Math.pow(16,i)
        }
    }
    console.log(sum)
    
    }

}()