Javascript Program for Number of pairs with maximum sum

// JavaScript program to count pairs
// with maximum sum.

// Function to find the number of
// maximum pair sums
function sum(a, n)
{
    
    // traverse through all the pairs
    let maxSum = Number.MIN_VALUE;
    for(let i = 0; i < n; i++)
        for(let j = i + 1; j < n; j++)
            maxSum = Math.max(maxSum,
                            a[i] + a[j]);

    // Traverse through all pairs and
    // keep a count of the number of
    // maximum pairs
    let c = 0;
    for(let i = 0; i < n; i++)
        for(let j = i + 1; j < n; j++)
            if (a[i] + a[j] == maxSum)
                c++;
    return c;
}

// Driver Code
let array = [ 1, 1, 1, 2, 2, 2 ];
let n = array.length;

document.write(sum(array, n));

// This code is contributed by code_hunt 

    // Javascript program to count pairs with maximum sum.
    
    // function to find the number
    // of maximum pair sums
    function sum(a, n)
    {
        
        // Find maximum and second maximum
        // elements. Also find their counts.
        let maxVal = a[0], maxCount = 1;
        let secondMax = Number.MIN_VALUE;
        let secondMaxCount = 0;
        for (let i = 1; i < n; i++)
        {
            if (a[i] == maxVal)
                maxCount++;
            else if (a[i] > maxVal)
            {
                secondMax = maxVal;
                secondMaxCount = maxCount;
                maxVal = a[i];
                maxCount = 1;
            }
            else if (a[i] == secondMax)
            {
                secondMax = a[i];
                secondMaxCount++;
            }
            else if (a[i] > secondMax)
            {
                secondMax = a[i];
                secondMaxCount = 1;
            }
        }
    
        // If maximum element appears
        // more than once.
        if (maxCount > 1)
            return maxCount * parseInt((maxCount - 1) / 2, 10);
    
        // If maximum element appears
        // only once.
        return secondMaxCount;
    }
    
    let array = [ 1, 1, 1, 2, 2, 2, 3 ];
    let n = array.length;

    document.write(sum(array, n));
    
    // This code is contributed by divyesh072019.