1691: [Usaco2007 Dec]挑剔的美食家 

  1 var
  2   nnn,root,xx,nn,n,m,i,j:longint;ans:int64;
  3   l,r,size,a,an,bn,am,bm:array[1..100000]of longint;
  4 function new(x:longint):longint;
  5   begin
  6   inc(nn);
  7   size[nn]:=1;a[nn]:=x; exit(nn);
  8   end;
  9 
 10 procedure insert(var t,x:longint);
 11   begin
 12   if t=0 then
 13     begin
 14     t:=new(x);
 15     exit;
 16     end;
 17   inc(size[t]);
 18   if x<a[t] then insert(l[t],x)
 19   else insert(r[t],x);
 20   end;
 21 function search(t,x:longint):longint;
 22   begin
 23   search:=0;
 24   while t<>0 do
 25     begin
 26     if (a[t]<=x)and(a[t]>search) then
 27       search:=a[t];
 28     if x<a[t] then
 29       t:=l[t]
 30     else t:=r[t];
 31     end;
 32   end;
 33 function delete(var t:longint; x:longint):longint;
 34   var rr,k:longint;
 35   begin
 36   dec(size[t]);
 37   if (x=a[t])or((x<a[t])and(l[t]=0))or((x>a[t])and(r[t]=0)) then
 38     begin
 39     rr:=a[t];
 40     if (l[t]=0)or(r[t]=0) then
 41       t:=l[t]+r[t]
 42     else a[t]:=delete(l[t],a[t]+1);
 43     exit(rr);
 44     end
 45   else if a[t]>x then exit(delete(l[t],x))
 46     else exit(delete(r[t],x));
 47   end;
 48 procedure sort1(l,r: longint);
 49       var
 50          i,j,xx,yy: longint;
 51       begin
 52          i:=l;
 53          j:=r;
 54          xx:=an[(l+r) div 2];
 55          repeat
 56            while an[i]<xx do
 57             inc(i);
 58            while xx<an[j] do
 59             dec(j);
 60            if not(i>j) then
 61              begin
 62                 yy:=an[i];
 63                 an[i]:=an[j];
 64                 an[j]:=yy;
 65                 yy:=bn[i];
 66                 bn[i]:=bn[j];
 67                 bn[j]:=yy;
 68                 inc(i);
 69                 j:=j-1;
 70              end;
 71          until i>j;
 72          if l<j then
 73            sort1(l,j);
 74          if i<r then
 75            sort1(i,r);
 76       end;
 77 procedure sort2(l,r: longint);
 78       var
 79          i,j,xx,yy: longint;
 80       begin
 81          i:=l;
 82          j:=r;
 83          xx:=am[(l+r) div 2];
 84          repeat
 85            while am[i]<xx do
 86             inc(i);
 87            while xx<am[j] do
 88             dec(j);
 89            if not(i>j) then
 90              begin
 91                 yy:=am[i];
 92                 am[i]:=am[j];
 93                 am[j]:=yy;
 94                 yy:=bm[i];
 95                 bm[i]:=bm[j];
 96                 bm[j]:=yy;
 97                 inc(i);
 98                 j:=j-1;
 99              end;
100          until i>j;
101          if l<j then
102            sort2(l,j);
103          if i<r then
104            sort2(i,r);
105       end;
106 
107 begin
108   readln(n,m);
109   for i:=1 to n do
110     readln(an[i],bn[i]);
111   for i:=1 to m do
112     readln(am[i],bm[i]);
113   sort1(1,n);sort2(1,m);
114   j:=1;
115   for i:=1 to m do
116     begin
117     if nnn>n then break;
118     while (an[j]<=am[i])and(j<=n) do
119       begin
120       insert(root,bn[j]);
121       inc(j);
122       end;
123     xx:=search(root,bm[i]);
124     if xx<>0 then
125       begin
126       inc(nnn);
127       ans:=ans+am[i];
128       delete(root,xx);
129       end;
130     end;
131   writeln(ans);
132   end.

 

posted @ 2013-03-18 17:26  lbz007  阅读(215)  评论(0)  编辑  收藏  举报
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