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Cod sursa(job #69093)
Program Stramosi;
const opt : array[0..6] of longint=(1,8,64,512,4096,32768,262144);
var m,n : longint;
S : array[0..250000,0..5] of longint;
log8 : array[1..250000] of integer;
Intrare,Iesire : text;
procedure Citeste;
var i : longint;
begin
assign(Intrare,'stramosi.in');
reset(Intrare);
readln(Intrare,n,m);
for i:=1 to n do read(Intrare,S[i,0]);
end;
procedure CalcLog8;
var i : longint;
p : integer;
begin
p:=0;
while opt[p+1]-1<=n do
begin
for i:=opt[p] to opt[p+1]-1 do log8[i]:=p;
p:=p+1;
end;
for i:=opt[p] to n do log8[i]:=p;
end;
procedure Calcule;
var i,j,ip : longint;
begin
CalcLog8;
for i:=0 to 5 do S[0,i]:=0;
for i:=1 to log8[n] do
begin
ip:=i-1;
for j:=1 to n do
S[j,i]:=S[S[S[S[S[S[S[S[j,ip],ip],ip],ip],ip],ip],ip],ip];
end;
end;
procedure Procesare;
var i,Q,P : longint;
lg : integer;
begin
assign(Iesire,'stramosi.out');
rewrite(Iesire);
for i:=1 to m do
begin
readln(Intrare,Q,P);
while (P>0) and (Q>0) do
begin
lg:=log8[P];
Q:=S[Q,lg];
P:=P-opt[lg];
end;
writeln(Iesire,Q);
end;
close(Intrare);
close(Iesire);
end;
begin
Citeste;
Calcule;
Procesare;
end.