MDOLLS - Nested Dolls

Tác giả: flashmt

Ngôn ngữ: Pascal

const fi='';
var test,it,n,re:longint;
    a,b,f:array[1..20000] of longint;

procedure sort(l,r:longint);
var i,j,x,y,t:longint;
begin
     i:=l; j:=r; x:=a[(i+j) shr 1]; y:=b[(i+j) shr 1];
     repeat
           while (a[i]<x) or ((a[i]=x) and (b[i]>y)) do inc(i);
           while (a[j]>x) or ((a[j]=x) and (b[j]<y)) do dec(j);
           if i<=j then
           begin
                t:=a[i]; a[i]:=a[j]; a[j]:=t;
                t:=b[i]; b[i]:=b[j]; b[j]:=t;
                inc(i); dec(j);
           end;
     until i>j;
     if i<r then sort(i,r);
     if l<j then sort(l,j);
end;

procedure rf;
var i:longint;
begin
     read(n);
     for i:=1 to n do read(a[i],b[i]);
     sort(1,n);
end;

function bs(x:longint):longint;
var l,r,m,i:longint;
begin
     l:=1; r:=re;
     while l<=r do
     begin
          m:=(l+r) shr 1;
          if f[m]<x then r:=m-1
          else l:=m+1;
     end;
     for i:=m-1 to m+1 do
          if (i>0) and (i<=re) and (f[i]<x) then exit(i);
end;

procedure pr;
var i,x:longint;
begin
     re:=1; f[1]:=b[1];
     for i:=2 to n do
         if b[i]<=f[re] then
         begin
              re:=re+1; f[re]:=b[i];
         end
         else
         begin
              x:=bs(b[i]);
              f[x]:=b[i];
         end;
     writeln(re);
end;

begin
     assign(input,fi); reset(input);
     read(test);
     for it:=1 to test do
     begin
          rf;
          pr;
     end;
     close(input);
end.

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