/**
We would like to hear what intrigues you about healthcare technology, and more specifically, why Robin interests you.

I like that Robin is relieving doctors of some of the administration work and allowing them to spend more time with
patients. I'm really interested in how NLP technology can be used to facilitate doctor/patient visits.



 * Write a function in JavaScript that accepts an array of integers and a number X as parameters,
 * when invoked, returns an array of unique indices of two numbers whose sum is equal to X.

For example: [1, 3, 4, 5, 6, 8, 10, 11, 13], Sum: 14

Pairs of indices: [0, 8], [1, 7], [2, 6], [4, 5]

 */

 let f = (arr, x) => {
    let uniqueIndices = [];
    for(let i=0; i<arr.length; i++){
        for(let j=i+1; j<arr.length; j++){
            if(arr[i] + arr[j] === x){
                uniqueIndices.push([i,j]);
            }
        }
    }
    console.log(uniqueIndices);
    return uniqueIndices;
 }

 f([1, 3, 4, 5, 6, 8, 10, 11, 13], 14);