bzoj1197

水题，画个图推一下低维的就什么都明白了

从低维类推高维

 var f:array[..,..] of int64;
     n,m,j,i:longint;
 
 begin
   readln(m,n);
   for i:= to n do
     f[i,]:=;
   for i:= to m do
     f[,i]:=*i;
   for i:= to n do
     for j:= to m do
       f[i,j]:=f[i,j-]+f[i-,j-];
   writeln(f[n,m]);
 end.