from copy import copy def find_items(items, i, res, diff): if diff <= 0: return res if i >= len(items): return False for j in range(i,len(items)): if items[j][2] <= diff: if items[j][3] >= 1: items[j][3] -= 1 new_res = copy(res) new_res.append(items[j]) new_res = find_items(items, j, new_res, diff-items[j][2]) if new_res: return new_res return False print 'case1' items = [[0,0,6,10],[0,0,1,2],[0,0,6,1]] print find_items(items,0,[],6) print 'case2' items = [[0,0,1,2],[0,0,2,2],[0,0,6,1]] print find_items(items,0,[],6) print 'case3' items = [[0,0,1,2],[0,0,1,2],[0,0,6,1]] print find_items(items,0,[],6)
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