18/11/09 20:38:18.97 Zs2FyImb.net
>>291 Ruby
args = [0, 1, 2, 3, 10, 9999, 123456789, 31415926535897]
floor_log10 = -> n {r = 1; (0..n).find{ r *= 10; r > n}}
kotae = ->n{
x = floor_log10[n + 1]
((9*x - 1)*10**x + 10)/18 + (n-10**x+1)/2 * (x
18/11/09 20:38:18.97 Zs2FyImb.net
>>291 Ruby
args = [0, 1, 2, 3, 10, 9999, 123456789, 31415926535897]
floor_log10 = -> n {r = 1; (0..n).find{ r *= 10; r > n}}
kotae = ->n{
x = floor_log10[n + 1]
((9*x - 1)*10**x + 10)/18 + (n-10**x+1)/2 * (x