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1374. Generate a String With Characters That Have Odd Counts 👎

  • Time: $O(n)$
  • Space: $O(n)$
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class Solution {
 public:
  string generateTheString(int n) {
    string s(n, 'a');
    if (n % 2 == 0)
      s.back() = 'b';
    return s;
  }
};

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class Solution {
  public String generateTheString(int n) {
    StringBuilder sb = new StringBuilder(n);
    for (int i = 0; i < n; ++i)
      sb.append('a');
    if (n % 2 == 0)
      sb.setCharAt(n - 1, 'b');
    return sb.toString();
  }
}

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class Solution:
  def generateTheString(self, n: int) -> str:
    s = 'a' * n
    if n % 2 == 0:
      s = s[:-1] + 'b'
    return s