题解 | 汽水瓶

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;
function calc(num, sum = 0) {
    curr = Math.floor(num / 3);
    sum += curr;
    if ((num % 3) + curr > 2) {
        return calc((num % 3) + curr, sum);
    }else if(num%3+curr === 2){
        return ++sum
    }
     else {
        return sum;
    }
}
void (async function () {
    // Write your code here
    while ((line = await readline())) {
        const total = +line;
        const sum = calc(total)
        sum && console.log(sum);
    }
})();