使java给出4个给定数字中3个数字的最大和

Question

When given 4 numbers, how do i find which 3 numbers out of the 4 will give the greatest sum. So if given 3 2 5 5, i want java to sum 3 5 5 for a total of 13

I have been searching for about 20 minutes and all i find is how the find the highest number of the 4 numbers. I know i absolutely can just write 16 lines of code comparing the 16 different combinations but i was hoping someone could point me in a faster direction.

Answer 1

First find the smallest number.

So for 3 2 5 5 it would be 2. Make sure you store this.

Thus, the numbers to sum are 3, 5 and 5

To get the total sum you need to add all the numbers together so:

3 + 2 + 5 + 5 = 15

And then minus the smallest number from the sum. So 15-2 which equals 13

Answer 2

First find the greatest of the four numbers and keep it aside.

Then find the greatest of the remaining three numbers and keep it aside.

Then find the greatest of the remaining two numbers and keep it aside.

Then sum up the numbers kept aside and display the result.

Answer 3

public static void main(String args[]) {
    int[] vals = new int[4];
    vals[0] = 3;
    vals[1] = 2;
    vals[2] = 5;
    vals[3] = 5;
    int result = sum4(vals);
    System.out.println("Sum of x+y = " + result);
}

private static int sum4(int[] nums)
{
    int retVal = 0;
    int lowest =  Integer.MAX_VALUE;
    for (int i=0; i<nums.length; i++)
    {
        if (nums[i] < lowest)
            lowest = nums[i];
        retVal += nums[i];
    }
    retVal -= lowest;
    return retVal;
}