|
|
вернуться в форумintuition When N=0, no number is there, or 0 is there. a[0]=1 When N=1, there are k such numbers, or 1..k-1. a[1]=k-1 When N=2, there are k^2-k such numbers. a[2]=>k^2-k =>(k-1)k =>(k-1)(k-1+1) =>(k-1)(k-1)+(k-1)*1 =>(k-1)a[1] + (k-1)*a[0] which can be used for all subsequent digits |
|
|