program soitario;
uses Math;
var N,M,i,j, soluzione, con_x, senza_x, nuovariga, nuovacolonna:longint;
griglia:array[0..12,0..12] of longint;
function gioca(r, c: longint): boolean;
begin
(*tris orizzontale*)
if (c-2>=0) and (griglia[r][c-2]=1) and (griglia[r][c-1]=1) then gioca:=false
(*tris orizzontale*)
else if (r-2>=0) and (griglia[r-2][c]=1) and (griglia[r-1][c]=1) then gioca:=false
(* Tris diagonale in alto a sx*)
else if (r-2>=0 ) and (c-2>=0) and (griglia[r-2][c-2]=1) and (griglia[r-1][c-1]=1) then gioca:=false
(* Tris diagonale in alto a dx*)
else if (r-2>=0) and (c+2<=M) and (griglia[r-2][c+2]=1) and (griglia[r-1][c+1]=1) then gioca:=false
else gioca := true;
end;
function riempi (riga, colonna:longint):longint;
begin
if riga>=N then begin riempi:=0; exit; end
else
begin
if griglia[riga,colonna]<>-1 then riempi:=griglia[riga,colonna]
else
begin
if colonna+1=M then nuovariga:=riga+1
else nuovariga:=riga;
nuovacolonna:= (colonna+1) mod M;
(* Non metto la X*)
senza_x:= riempi(nuovariga,nuovacolonna); con_x:=0;
griglia[nuovariga,nuovacolonna]:=0;
(*Se posso, metto la X*)
if gioca (riga,colonna)=true then
begin
if colonna+1=M then nuovariga:=riga+1
else nuovariga:=riga;
nuovacolonna:= (colonna+1) mod M;
griglia[nuovariga][nuovacolonna]:=1;
con_x:= 1 + Riempi(nuovariga,nuovacolonna);
for i:=1 to N do begin
for j:=1 to M do write(griglia[i,j],' '); writeln; end; writeln;
(* Reset della griglia[riga][col]*)
griglia[riga][colonna]:=-1;
end;
(*Ritorno la soluzione migliore*)
end;
griglia[riga][colonna]:= max(senza_x,con_x);
riempi:=griglia[riga, colonna];
end;
end;
begin
readln(N,M);
for i:=0 to N do
for j:=0 to M do griglia[i,j]:=-1;
con_x:= 0;
writeln(riempi(0 , 0));
end.
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