Cod sursa(job #196631)

Utilizator theratmantheratman theratman Data 27 iunie 2008 16:33:06
Problema Cautare binara Scor 10
Compilator fpc Status done
Runda Arhiva educationala Marime 0.82 kb
var f,g:text;
    a:array[1..100000]of longint;
    n,m,i,poz,x,op,c,st,dr:longint;
begin
assign(f,'cautbin.in');reset(f);
assign(g,'cautbin.out');rewrite(g);
read(f,n);
for i:=1 to n do read(f,a[i]);
read(f,m);
for i:=1 to m do begin
 read(f,op,x);
 st:=1;
 dr:=n;
 poz:=0;
 while (st<=dr)and(poz=0) do begin
  c:=st+(dr-st)div 2;
  if x<a[c] then dr:=c-1;
  if x>a[c] then st:=c+1;
  if x=a[c] then poz:=c;
 end;
 if poz<>0 then begin
  if op=0 then begin
   while x=a[poz+1] do inc(poz);
   writeln(g,poz);
  end;
  if op=1 then writeln(g,poz-1);
  if op=2 then writeln(g,poz+1);
 end;
 if poz=0 then begin
  if op=0 then writeln(g,'-1');
  if op=1 then begin
   poz:=dr;
   writeln(g,poz);
  end;
  if op=2 then begin
   poz:=st;
   writeln(g,poz);
  end;
 end;
end;
close(f);
close(g);
end.