FOCUS - Chuyên gia ruồi
Tác giả: flashmt
Ngôn ngữ: Pascal
const fi='';
maxn=400040;
var n,num,max:longint;
aa,d,f:array[0..maxn] of longint;
a:array[0..maxn shr 1] of longint;
b:array[0..maxn shr 1,1..3] of longint;
procedure sort(l,r:longint);
var i,j,x,y:longint;
begin
i:=l; j:=r; x:=aa[(i+j) shr 1];
repeat
while aa[i]<x do i:=i+1;
while aa[j]>x do j:=j-1;
if i<=j then
begin
y:=aa[i]; aa[i]:=aa[j]; aa[j]:=y;
y:=d[i]; d[i]:=d[j]; d[j]:=y;
i:=i+1; j:=j-1;
end;
until i>j;
if i<r then sort(i,r);
if l<j then sort(l,j);
end;
procedure rf;
var i,j:longint; c:char;
begin
readln(n);
for i:=1 to n do
begin
read(c);
if c<>'?' then
begin
readln(a[i]);
num:=num+1;
aa[num]:=a[i];
d[num]:=i;
if c='-' then a[i]:=-a[i];
end
else
begin
for j:=1 to 3 do read(b[i,j]);
num:=num+2;
aa[num-1]:=b[i,2]; d[num-1]:=-i;
aa[num]:=b[i,3]; d[num]:=i;
readln;
end;
end;
end;
procedure edit;
var i:longint;
begin
max:=0;
for i:=1 to num do
begin
if aa[i]<>aa[max] then
begin
inc(max);
aa[max]:=aa[i];
end;
if a[abs(d[i])]<>0 then
begin
if a[d[i]]>0 then a[d[i]]:=max
else a[d[i]]:=-max;
end
else
begin
if d[i]<0 then b[-d[i],2]:=max
else b[d[i],3]:=max;
end;
end;
end;
procedure add(x,v:longint);
begin
while x<=max do
begin
f[x]:=f[x]+v;
x:=x+x and (-x);
end;
end;
function calc(x:longint):longint;
var r:longint;
begin
r:=0;
while x>0 do
begin
r:=r+f[x];
x:=x-x and (-x);
end;
calc:=r;
end;
procedure pr;
var i,t,l,r,m,u,j:longint;
begin
sort(1,num);
edit;
for i:=1 to n do
if a[i]<>0 then
begin
if a[i]>0 then add(a[i],1)
else add(-a[i],-1);
end
else
begin
t:=calc(b[i,2]-1)+b[i,1];
l:=b[i,2]; r:=b[i,3];
if calc(r)<t then writeln(0)
else
begin
while l<=r do
begin
m:=(l+r) shr 1;
u:=calc(m);
if u<t then l:=m+1
else r:=m-1;
end;
for j:=m-1 to m+1 do
if (j>=b[i,2]) and (j<=b[i,3]) and (calc(j)>=t) then break;
writeln(aa[j]);
end;
end;
end;
begin
assign(input,fi); reset(input);
rf;
pr;
close(input);
end.