Phương pháp xử lí trạng thái (Vét cạn khử đệ quy Đồ thị trạng thái Quy hoạch động trạng thái)

Vét cạn khử đệ quy Đồ thị trạng thái Quy hoạch động trạng thái QBSELECT, QBGAME, CHESSCBG, LEM2, LEM3, MIXUP2, LASCALE, CHNREST (), VMMTFIVE Phương pháp xử lí trạng thái (Vét cạn khử đệ quy Đồ thị trạng thái Quy hoạch động trạng thái)

 T 1/5  . Tôi :  t  . a. ..  T 2/5 I.  : [i] (1<=i<=n) |a[i]|<=10^8.  (k<=n) C (|C|<=2*(10^9)) cho . . ). ) 0,1  . Var n:byte; C:longint; A:array[1 18]of longint; x,bestSelection:array[1 18]of byte; Procedure try(i:byte); Var j,k:byte; Test:longint; Begin For j:=0 to 1 do begin x[i]:=j; if (i<n) then try(I+1) else begin test=0; for k:=1 to n do inc(test,x[k]*a[k]); if ((test<=C)and (test>bestsum)) then begin . bestsum:=test; bestselection:=x; end; end; End; End; Var n:byte; bestsum ,C:longint; bestselection:longword; A:array[1 18]of longint; Procedure duyet; Var I,k:byte; Test:longint; S,last:longword; Begin Bestsum:=0; Bestselection:=0;  last:=(1 shl n)- 1; . For s:=1 to last do begin Test:=0; For i:=0 to n-1 do inc(Test,((s shr I) and 1)*a[i+1]); If (Test>bestsum) and (Test <=C) then begin bestsum:= Test; bestselection:=s; End; End; End;  T 3/5 (n*(2^n), dng . . Var n:byte; C,bestsum:longint; A:array[1 18]of longint; bestselection:longword; Procedure duyettrangthaicocchan; Var I,k:byte; T : array[0 1 shl 18]of longint; . S,p,last:longword; Begin -. Bestsum:=0; Bestselection:=0; T[0]:=0;  For s:=1 to last do begin For i:=0 to n-1 do  If (((s shr i) and 1)=1) then break; P:= s and (not (1 shl i)); //P <s.  i  i 0) T[s]:=T[p] + a[i+1]; If (T[s]>bestsum) and (T[s]<=C) then begin bestsum:=t[s]; bestselection:=s; End; End; End; (i*(2^n)) i . N  1) i ngay khi i=0.  T 4/5 II. : : CHESSCBG (http://vn.spoj.pl/problems/CHESSCBG/) Mt bàn c th là mt bng gm 4 dòng, 4 ct. Mi th c là mt cách sp xp 8 quân c, hai quân khác nhau  t ra là cho hai th c 1 và 2, hãy tìm mt s ít nhc di chuy chuyn t th 1 sang th 2; mc di chuyn quân là mt ln chuyn quân c sang ô trng k cnh vi ô quân c ng. Input: T n gm 8 dòng, mi dòng là mt xâu nh  dài 4 mà s ng vi v trí có hoc không có quân c. Bn dòng u là th c 1, bn dòng sau là th c 2. Output: Gm 1 dòng duy nht là s c chuyn quân ít nht .  16bit. . . III. Quy H: sau:  *n. Output: t. Sau khi  . :(n!) =20i /sy trong   : .  +1. T[SS S. {a,b,c, di ,b,c,d  T[ {1,2,5} = 10011= 19 : - T[ {2,5} = 10010 =18 } + a[3,1]; - T[ {1,5} = 10001 =17 } + a[3,2]; - T[ {1,2} = 00011 = 3 } + a[3,5];  T 5/5 3. => T[19. : s k = 1)  i S. [  = (1 shl n)-1 ]1 giây.  . (n*(2^n)) IV.  : QBSELECT, QBGAME, CHESSCBG, LEM2, LEM3, MIXUP2, LASCALE, CHNREST (*), VMMTFIVE