Cod sursa(job #720701)

Utilizator ignadariusIgna Darius ignadarius Data 22 martie 2012 20:34:08
Problema Cautare binara Scor 0
Compilator fpc Status done
Runda Arhiva educationala Marime 1.11 kb
var f,g:text;v:array[1..100000]of integer;n,m,i,x,b,a:longint;

function caut1(lo,hi:longint):integer;
var mid:longint;
begin
while lo<=hi do
begin
mid:=lo+(hi-lo)div 2;
if v[mid]<=x then begin b:=mid;lo:=mid+1 end
else hi:=mid-1;
end;
caut1:=b;
end;

function caut2(lo,hi:longint):integer;
var mid:longint;
begin
while lo<=hi do
begin
mid:=lo+(hi-lo)div 2;
if v[mid]>=x then begin b:=mid;hi:=mid-1 end
else lo:=mid+1;
end;
caut2:=b;
end;

function caut0(lo,hi:longint):integer;
 var mid:integer;
 begin
while lo<=hi do
begin
mid:=lo+(hi-lo)div 2;
if v[mid]<x then lo:=mid+1 else
                          if v[mid]>x then hi:=mid-1 else
                          if (v[mid]=x)and(v[mid+1]<>x) then caut0:=mid
                          else lo:=mid+1;
end;
caut0:=b;
end;
begin
assign(f,'cautbin.in');reset(f);
assign(g,'cautbin.out');rewrite(g);
readln(f,n);
for i:=1 to n do
read(f,v[i]);
readln(f,m);
for i:=1 to n do
begin
readln(f,a,x);b:=-1;
if a=0 then writeln(g,caut0(1,n));
if a=1 then writeln(g,caut1(1,n));
if a=2 then writeln(g,caut2(1,n));
end;
close(f);
close(g);
end.