third-maximum-number.cc

// Third Maximum Number
class Solution {
public:
  int thirdMax(vector<int>& nums) {
    long a = LONG_MIN, b = LONG_MIN, c = LONG_MIN;
    for (int x: nums) {
      if (x > c && x != b && x != a) {
        c = x;
        if (c > b) swap(c, b);
        if (b > a) swap(b, a);
      }
    }
    return c == LONG_MIN ? a : c;
  }
};