题解 | #称砝码# new Set()

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(await readline()) {
        let m = (await readline()).split(' ').map(Number)
        let x = (await readline()).split(' ').map(Number)
        let res = new Set([0])
        for (let i=0; i<m.length; i++) {
            for (let j=0; j<x[i]; j++) {
                let tmp = [...res]
                tmp.forEach(el => {
                    let w = el + m[i]
                    res.add(w)
                })
            }
        }
        console.log(res.size)
    }
}()

思路是，初始化一个Set，元素是0，然后每碰到一个数就对当前Set的每个元素加这个新碰到的数，Set可以自动去重