1
/**
2
 * @param {number} a
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 * @param {number} b
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 * @return {string}
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 */
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var strWithout3a3b = function (a, b) {
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  let r = "";
8

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  let A = "a",
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    AA = A + A;
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  let B = "b",
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    BB = B + B;
13

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  while (a > 0 || b > 0) {
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    if (a > b) {
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      a = calculate(a, A, AA);
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      b = calculate(b, B, BB, true);
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    } else {
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      b = calculate(b, B, BB);
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      a = calculate(a, A, AA, true);
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    }
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  }
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  return r;
25

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  function calculate(v, s, ss, l = false) {
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    if (l) {
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      if (v > 0) {
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        (r += s), (v -= 1);
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      }
31

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      return v;
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    }
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    let c = v >= 2 && r[r.length - 1] !== s;
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    r += c ? ss : s;
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    v -= c ? 2 : 1;
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    return v;
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  }
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};