讨论 / ok!ok!ye
sunjunhan 2015-08-21 20:14:05
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var a,f:array [-1..22,-1..22] of int64;

n,m,i,j,x,y:longint;

BEGIN

readln(n,m,x,y);

f[x,y]:=-1;

f[x-2,y-1]:=-1;

f[x-2,y+1]:=-1;

f[x+2,y-1]:=-1;

f[x+2,y+1]:=-1;

f[x-1,y-2]:=-1;

f[x-1,y+2]:=-1;

f[x+1,y-2]:=-1;

f[x+1,y+2]:=-1;

f[0,0]:=1;

for j:=0 to m do

for i:=0 to n do

if f[i,j]<>-1 then

begin

if f[i,j-1]<>-1 then f[i,j]:=f[i,j]+f[i,j-1];

if f[i-1,j]<>-1 then f[i,j]:=f[i,j]+f[i-1,j];

end;

writeln(f[n,m]);

END.

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