Maximum Product of Two Elements in an Array — C++

// Time:  O(n)
// Space: O(1)

class Solution {
public:
    int maxProduct(vector<int>& nums) {
        int m1 = 0, m2 = 0;
        for (const auto& num : nums) {
            if (num > m1) {
                m2 = m1;
                m1 = num;
            } else if (num > m2) {
                m2 = num;
            }
        }
        return (m1 - 1) * (m2 - 1);
    }
};