题解 | 统计每个月兔子的总数

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void (async function () {
    let n = parseInt(await readline());
    let a = 1, b = 1, c = 1;
    for (let i = 3; i <= n; i++) {
        c = a + b;
        a = b;
        b = c;
    }
    console.log(c);
})();