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1796. Second Largest Digit in a String 👍

  • Time: $O(n)$
  • Space: $O(1)$
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class Solution {
 public:
  int secondHighest(string s) {
    int maxDigit = -1;
    int secondMaxDigit = -1;

    for (const char c : s)
      if (isdigit(c)) {
        const int digit = c - '0';
        if (digit > maxDigit) {
          secondMaxDigit = maxDigit;
          maxDigit = digit;
        } else if (maxDigit > digit && digit > secondMaxDigit) {
          secondMaxDigit = digit;
        }
      }

    return secondMaxDigit;
  }
};

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class Solution {
  public int secondHighest(String s) {
    int maxDigit = -1;
    int secondMaxDigit = -1;

    for (final char c : s.toCharArray())
      if (Character.isDigit(c)) {
        final int digit = Character.getNumericValue(c);
        if (digit > maxDigit) {
          secondMaxDigit = maxDigit;
          maxDigit = digit;
        } else if (maxDigit > digit && digit > secondMaxDigit) {
          secondMaxDigit = digit;
        }
      }

    return secondMaxDigit;
  }
}

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class Solution:
  def secondHighest(self, s: str) -> int:
    maxDigit = -1
    secondMaxDigit = -1

    for c in s:
      if c.isdigit():
        d = int(c)
        if d > maxDigit:
          secondMaxDigit = maxDigit
          maxDigit = d
        elif maxDigit > d > secondMaxDigit:
          secondMaxDigit = d

    return secondMaxDigit