, . - , . , , . - .
A(1)<A(2)<,...,<A(n) . , , , k, (k)=. - , .
S , A(s). A(s)=, .
.
A(s)<, , 1 s, , A(s)>, , S n, .
. , . . , , =12 - , , S . =12 (2, 3, 4, 6, 10, 12, 20, 30, 35, 45) . 23.
. 22 , .
. . .
.
:
1. .
2. 1,, n .
3. a1, a2,..., a15. .
4. x1,x2,...,x20. ,
, .
5. a1,a2,...,a15.
.
6. x1,x2,...,x20.
.
7.
.
8.
, X(i)=Y(j).
9. ,
,
.