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export default function getSmallestString(n: number, k: number): string {    if (n * 26 === k) return "z".repeat(n);    let s = "", num = 0;    for (let i = 0; i < n; i++) {        const diff = (n - i - 1) * 26 - (k - num);        if (diff >= 0) {            s += "a";            num++;        } else {            const code = Math.abs(diff);            num += code;            s += String.fromCharCode(code + 96);            break;        }    }    return s.padEnd(n, "z");}