De dap an thi HSG Tin hoc 12 nam 2012 Yen Bai

<span class='text_page_counter'>(1)</span>SỞ GIÁO DỤC VÀ ĐÀO TẠO TỈNH YÊN BÁI. HƯỚNG DẪN CHẤM KỲ THI CHỌN HỌC SINH GIỎI LỚP 12 THPT NĂM HỌC 2012 – 2013 Môn thi: TIN HỌC 12 Ngày thi: 08/10/2012. HD chấm đề thi chính thức (Hướng dẫn chấm có 04 trang) Câu 1. Đáp án. Kinh doanh Uses Crt; Const fi='KD.inp'; fo='KD.out'; Nmax=1000+2; Var f: text; a: array[1..Nmax,1..Nmax] of longint; m,n: longint; MAX: array[1..Nmax] of longint; Procedure doctep; var i,j: longint; Begin Assign(f,fi); Reset(f); Readln(f,m,n); For i:=1 to m do For j:=1 to n do read(f,a[i,j]); Close(f); End; Procedure xuli; var i,j: longint; Begin For i:=1 to m do begin max[i]:=a[1,j]; For j:=1 to n do if max[i]<a[i,j] then max[i]:=a[i,j]; end; End; Procedure ghikq; var i,j: longint; Begin Assign(f,fo); Rewrite(f); For i:=1 to m do writeln(f,i,#32,max[i]); close(f); End; Begin doctep; xuli; ghikq; End. ---------------------. 2. Cắm trại Uses Crt; Const fi='CAMTRAI.inp'; fo='CAMTRAI.out'; Nmax=1000+2; Var f: text;. Điểm 6,0 đ. 1,0 đ. 1,0 đ. 1,0 đ. 1,0 đ. 0,5 đ. 0,5 đ. 1,0dd. 6,0 đ. 1,0 đ.

<span class='text_page_counter'>(2)</span> a: array[0..Nmax,0..Nmax] of longint; m,n,dem: longint; Procedure doctep; var i,j: longint; Begin Assign(f,fi); Reset(f); Readln(f,m,n); For i:=1 to m do For j:=1 to n do read(f,a[i,j]); Close(f); End; Function sodep(p,q:longint) : Boolean; Begin exit((a[p-1,q] >= 1) and (a[p+1,q] >= 1) and (a[p,q-1] >= 1) and (a[p,q+1] >= 1)); End; Procedure xuli; var i,j: longint; Begin Assign(f,fo); Rewrite(f); dem:=0; For i:=1 to m do For j:=1 to n do IF A[I,J]=0 THEN if sodep(i,j) then inc(dem); Write(f,dem); End; Procedure ghikq; Begin close(f); End; Begin doctep; xuli; ghikq; End. 3. Ba lô program bt1; uses crt; const fi='balo.inp'; fo='balo.out'; var a,c:array[1..20] of integer; fx:array[0..20,0..20] of integer; kt:array[0..100] of 0..1; n,w,i:integer; procedure doc; var i,j:integer; f:text; begin assign(f,fi);reset(f); readln(f,n,w); for i:=1 to n do readln(f,a[i],c[i]); close(f); end; function max(a,b:integer):integer; begin if a>b then max:=a else max:=b; end;. 1,0 đ. 1,0 đ. 1,0 đ 1,0 đ. 1,0 đ. 5,0 đ. 1,0 đ. 1,0 đ. 1,0 đ.

<span class='text_page_counter'>(3)</span> procedure taobang; var k,v:integer; begin for v:=1 to w do if v>=a[1] then fx[1,v]:=c[1] else fx[1,v]:=0; for k:=2 to n do for v:=1 to w do if v>=a[k] then fx[k,v]:=max(fx[k-1,v-a[k]]+c[k], fx[k-1,v]) else fx[k,v]:=fx[k-1,v]; for k:=1 to n do begin for v:=1 to w do write(fx[k,v]:3); writeln; end; end; procedure trabang; var f:text; k,v:integer; begin assign(f,fo);rewrite(f); k:=n; v:=w; writeln('fx=',fx[k,v]); repeat while fx[k,v]=fx[k-1,v] do dec(k); kt[k]:=1; v:=v-a[k]; until v=0;. 1,0 đ. 1,0đ. for k:=1 to n do if kt[k]=1 then writeln(a[k],' ',c[k]); close(f); end; begin clrscr; for i:=1 to n do kt[i]:=0; doc; taobang; trabang; readln; end. 4. Đồ thị Uses crt; //Tim duong di ngan nhat tren do thi co huong Type cung = record x,y,w: longint; end; Const fi='Dothi.inp'; fo='Dothi.out'; MMax=1000; Nmax=1000; Pmax=1000; Wmax=Mmax*Pmax; Var f:text; a: array[1..Mmax] of cung; p: array[1..Pmax] of longint; vet: array[1..Nmax] of longint; n,m,s,t: longint; Procedure doctep; Var i,j: longint;. 3,0 đ. 1.0 đ.

<span class='text_page_counter'>(4)</span> Begin Assign(f,fi); reset(f); readln(f,n,m,s,t); For i:=1 to M do with a[i] do readln(f,x,y,w); close(f); for j:=1 to N do p[j]:=Wmax; p[s]:=0; End; Function cocung(a: cung): boolean; var tam:boolean; Begin with a do begin tam:= (p[x]<Wmax) and (p[y]>p[x]+w); if tam then begin p[y]:=p[x]+w; vet[y]:=x; end; end; cocung:=tam; End; Procedure BellmanFord; var i,j: longint; stop: boolean; Begin for j:=1 to n- 1 do begin stop:=true; for i:=1 to m do if cocung(a[i]) then stop:=false; if stop then break; end; End; Procedure ghikq; begin assign(f,fo); rewrite(f); if p[t]=WMax then write(f,'Khong ton tai duong di tu S den t') else begin writeln(f,p[t]); while s<>t do begin write(f,t,'<-'); t:=vet[t]; end; write(f,s); end; close(f); end; Begin doctep; BellmanFord; ghikq; End. 04 câu. 1,0 đ. 1,0đ. Tổng điểm:. 20đ.

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