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// 187. Repeated DNA Sequences
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var findRepeatedDnaSequences = function (s) {
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  let map = {};
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  let res = [];
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  for (let i = 0; i <= s.length - 10; i++) {
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    let s10 = s.substring(i, i + 10);
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    map[s10] = (map[s10] || 0) + 1;
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    if (map[s10] === 2) res.push(s10);
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  }
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  return res;
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};