Problem:
Score : 400 points

Problem Statement

Takahashi is going to buy N items one by one.

The price of the i-th item he buys is A_i yen (the currency of Japan).

He has M discount tickets, and he can use any number of them when buying an item.

If Y tickets are used when buying an item priced X yen, he can get the item for \frac{X}{2^Y} (rounded down to the nearest integer) yen.

What is the minimum amount of money required to buy all the items?

Constraints

All values in input are integers.

1 \leq N, M \leq 10^5

1 \leq A_i \leq 10^9

Input

Input is given from Standard Input in the following format:

N M
A_1 A_2 ... A_N

Output

Print the minimum amount of money required to buy all the items.

Sample Input 1

3 3
2 13 8

Sample Output 1

9

We can buy all the items for 9 yen, as follows:

Buy the 1-st item for 2 yen without tickets.

Buy the 2-nd item for 3 yen with 2 tickets.

Buy the 3-rd item for 4 yen with 1 ticket.

Sample Input 2

4 4
1 9 3 5

Sample Output 2

6

Sample Input 3

1 100000
1000000000

Sample Output 3

0

We can buy the item priced 1000000000 yen for 0 yen with 100000 tickets.

Sample Input 4

10 1
1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000

Sample Output 4

9500000000

Solution in JavaScript (node.js v5.12) (judge verdict: Time Limit Exceeded)

input = require('fs').readFileSync('/dev/stdin', 'utf8')
lines = input.split('\n')
line = lines.shift().split(' ')
N = line[0] * 1
K = line[1] * 1 
A = lines.shift().split(' ').map(x => x * 1)

_makePriorityQueue = (arr, max) => {
  var idx = ~~(arr.length / 2)
  return _heapify(arr, idx, max);
}


_heapify = (arr, idx, max) =>  {
  while(idx >= 0) {
    var min = max ?  _swapHeapMax(arr, idx) : _swapHeapMin(arr, idx)
    if (min != idx) {
        idx = min
    } else {
        idx = idx - 1
    }
  }
  return arr
}

_swapHeapMin = (arr, idx) =>  {
    var left = idx * 2 + 1
    var right = idx * 2 + 2
    var min = idx
    if (left < arr.length && arr[left] < arr[idx]) {
      min = left
    }
    if (right < arr.length && arr[right] < arr[min]) {
      min = right
    }
    if (min != idx) {
      var tmp = arr[idx]
      arr[idx] = arr[min]
      arr[min] = tmp
    }
    return min
}


_swapHeapMax = (arr, idx) =>  {
    var left = idx * 2 + 1
    var right = idx * 2 + 2
    var min = idx
    if (left < arr.length && arr[left] > arr[idx]) {
      min = left
    }
    if (right < arr.length && arr[right] > arr[min]) {
      min = right
    }
    if (min != idx) {
      var tmp = arr[idx]
      arr[idx] = arr[min]
      arr[min] = tmp
    }
    return min
}


_popPrioriyQueue = (a, max) => {
    var tmp = a[0]
    a[0] = a[a.length - 1]
    a.pop()
    a = _heapify(a, 0, max)
    return tmp
}

_pushPrioriyQueue = (a, d, max) => {
    a.push(d)
    a = _heapify(a, a.length, max)
}

_makePriorityQueue(A, true)
for(i=0; i<K; i++) {
    a = _popPrioriyQueue(A, true)
    _pushPrioriyQueue(A, ~~(a /2), true)
}

sum = A.reduce((s, c) => s += c, 0)
console.log(sum)