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2873. Maximum Value of an Ordered Triplet I 👍

  • Time: $O(n)$
  • Space: $O(1)$
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class Solution {
 public:
  long long maximumTripletValue(vector<int>& nums) {
    long ans = 0;
    int maxDiff = 0;  // max(nums[i] - nums[j])
    int maxNum = 0;   // max(nums[i])

    for (const int num : nums) {
      ans = max(ans, static_cast<long>(maxDiff) * num);  // num := nums[k]
      maxDiff = max(maxDiff, maxNum - num);              // num := nums[j]
      maxNum = max(maxNum, num);                         // num := nums[i]
    }

    return ans;
  }
};

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class Solution {
  public long maximumTripletValue(int[] nums) {
    long ans = 0;
    int maxDiff = 0; // max(nums[i] - nums[j])
    int maxNum = 0;  // max(nums[i])

    for (final int num : nums) {
      ans = Math.max(ans, (long) maxDiff * num); // num := nums[k]
      maxDiff = Math.max(maxDiff, maxNum - num); // num := nums[j]
      maxNum = Math.max(maxNum, num);            // num := nums[i]
    }

    return ans;
  }
}

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class Solution:
  def maximumTripletValue(self, nums: list[int]) -> int:
    ans = 0
    maxDiff = 0  # max(nums[i] - nums[j])
    maxNum = 0   # max(nums[i])

    for num in nums:
      ans = max(ans, maxDiff * num)         # num := nums[k]
      maxDiff = max(maxDiff, maxNum - num)  # num := nums[j]
      maxNum = max(maxNum, num)             # num := nums[i]

    return ans