Question

I have got a weird situation. There is an array that has got numbers from 1 – 20, the other array has got all the random numbers. Using Array.Sort(rand) I’m able to sort the randnos array. But how can I give a rank to those numbers using the numbers array.

Should I use the sorting algorithms? Or are there any available stuff?

Answer 1

Given an array of random numbers:

var rand = new Random();
    // generate an array of 10 random numbers between 1 and 100
var randNumbers = Enumerable.Range(1,10)                  // enumerable 1 to 10
                            .Select(_ => rand.Next(100))  // replace with random num
                            .ToArray();                   // convert to array

Here is a method to sort them and provide their rank, as a string number-rank:

var sorted = randNumbers.OrderBy(x => x)                   // sort by the number
                        .Select((val,idx) =>               // given the value and the index
                                 String.Format("{0}-{1}",  // return value-index as string
                                        val,idx+1))
                        .ToArray();                        // convert to array

Prints (for example):

21-1 
30-2 
31-3 
32-4 
40-5 
51-6 
67-7 
70-8 
84-9 
99-10

Note that you could also have done:

randNumbers.Sort() // sort in place first
var sorted = ... // same as above without the OrderBy