монеты

#include<iostream>
#include <algorithm>

using namespace std;

int main()
{
  int n, sum;
  cin >> n >> sum;
  int *arr = new int[n];

  for (int i = 0; i < n; i++)
     cin >> arr[i];

  int *result = new int [sum+1];

  result[0] = 0;

  for(int s=1 ; s <= sum; ++s)
  {
    result[s] = INT16_MAX;
    for (int i = 0; i < n; ++i)
      if (s - arr[i] >= 0)
        result[s] = min(result[s], result[s - arr[i]] + 1);
  }

  if (result[sum] != INT16_MAX)
    cout << result[sum];
  else cout << -1;
}