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TLE是事实,但我想搞清楚,为什么会这么慢。。。In Reply To:我不太说得清楚,您一看代码就明白了。。。 Posted by:js05 at 2005-05-13 15:11:07 > type point=record > x,y:longint; > end; > > var ps:array [1..15000] of point; > num:array [0..14999] of longint; > c:array [1..32001] of longint; > n,limit:longint; > > procedure init; > var i:longint; > begin > readln(n); > limit:=0; > for i:=1 to n do > begin > readln(ps[i].x,ps[i].y); > inc(ps[i].x); > inc(ps[i].y); > if ps[i].y>limit then > limit:=ps[i].y; > end; > end; > > procedure swap(var a,b:point); > var c:point; > begin > c:=a; > a:=b; > b:=c; > end; > > procedure qsort(s,t:longint); > var i,j:longint; > x:point; > begin > swap(ps[s],ps[s+random(t-s)+1]); > i:=s; > j:=t; > x:=ps[s]; > while i<j do > begin > while ((ps[j].x>x.x) or ((ps[j].x=x.x) and (ps[j].y>x.y))) and (j>i) do > dec(j); > if i<j then > begin > ps[i]:=ps[j]; > inc(i); > end; > while ((ps[i].x<x.x) or ((ps[i].x=x.x) and (ps[i].y<x.y))) and (i<j) do > inc(i); > if j>i then > begin > ps[j]:=ps[i]; > dec(j); > end; > ps[i]:=x; > end; > if s<pred(i) then > qsort(s,pred(i)); > if succ(i)<t then > qsort(succ(i),t); > end; > > function lowbit(x:longint):longint; > begin > lowbit:=x and (x xor (x-1)); > end; > > procedure insert(x:longint); > begin > while x<=limit do > begin > inc(c[x]); > inc(x,lowbit(x)); > end; > end; > > function sum(x:longint):longint; > begin > sum:=0; > while x>0 do > begin > inc(sum,c[x]); > dec(x,lowbit(x)); > end; > end; > > procedure main; > var i:longint; > begin > filldword(num,sizeof(num) div 4,0); > filldword(c,sizeof(c) div 4,0); > for i:=1 to n do > begin > inc(num[sum(ps[i].y)]); > insert(ps[i].y); > end; > end; > > procedure print; > var i:longint; > begin > for i:=0 to n-1 do > writeln(num[i]); > end; > > begin > init; > qsort(1,n); > main; > print; > end. > > 莫非此代码不是nlogn的复杂度? Followed by:
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