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May 13th, 2016
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  1. function pairwise(arr, arg) {
  2.   var res = 0;
  3.   var pairs = [];
  4.   for(var i = 0; i < arr.length-1; i++){
  5.     for(var j = i+1; j < arr.length; j++){
  6.       if(arr[i] + arr[j] == arg){
  7.         if(pairs.indexOf(i) == -1 && pairs.indexOf(j) == -1){
  8.           pairs.push(i);
  9.           pairs.push(j);
  10.           res += i + j;
  11.         }
  12.       }  
  13.     }
  14.   }
  15.   return res;
  16. }
  17.  
  18. pairwise([0, 0, 0, 0, 1, 1], 1);
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