任务一的源程序：



const



dx:array[1..4]of integer=(2,2,1,1)



dy:array[1..4]of integer=(1,-1,2,-2)



type



map=record



x,y:integer



end



var



i,j,n,m,k:integer



a:array[0..50,0..50]of map



begin



read(n,m)



fillchar(a,sizeof(a),0)



a[n,m].x:=-1 a[n,m].y:=-1 {标记为终点}



for i:=n downto 2 do {倒推}



for j:=1 to m do



if a[i,j].x<>0 then



for k:=1 to 4 do



begin



a[i-dx[k],j-dy[k]].x:=i



a[i-dx[k],j-dy[k]].y:=j



end



if a[1,1].x=0 then writeln( no )



else begin{存在路径}



i:=1 j:=1



write( ( ,i, , ,j, ) )



while a[i,j].x<>-1 do



begin



k:=i



i:=a[i,j].x j:=a[k,j].y



write( ->( ,i, , ,j, ) )



end



end



end.