# bin packing algo (estimation)
# since it is Np- Hard
# for better methods (first fit and best fit) use self balancing trees
# this one is Next fit

def bins_needed(item_weights, bin_capacity):
  remain= bin_capacity
  bins=0
  for i in item_weights:
    if i> bin_capacity:
      bins+=1
      remain= bin_capacity
    else:
      bin_capacity-= i
  return bins

wt= [2, 5, 4, 7, 1, 3, 8]
cap= 10
print(bins_needed(wt, cap))