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function findRepeatedDnaSequences(s: string): string[] {    const L = 10;    const ans: string[] = [];    const cnt: Map<string, number> = new Map();    const n = s.length;    for (let i = 0; i <= n - L; ++i) {        const sub = s.slice(i, i + L);        cnt.set(sub, (cnt.get(sub) || 0) + 1);        if (cnt.get(sub) === 2) {            ans.push(sub);        }    }    return ans;}export default findRepeatedDnaSequences;