BZOJ1208 [HNOI2004]宠物收养所 【Splay】
和前一题差不多,只是求前驱和后继的时候不再是树中节点,而是另外的,这不影响,差不多的方法做。
然后就是给树打标记,宠物树标记和客人树的标记。
然后就差不多啦。今天写了两题$Splay$呢。
o(╯□╰)o,求前驱后继的变量弄错了调了半天。TAT
# include <stdio.h> using namespace std; const int Max=200010; int ch[Max][2],fa[Max],data[Max],root,ind=1,sum=0; inline int min(int a,int b) {return a<b?a:b;} inline int abs(int a) {return a<0?-a:a;} inline void rotate(int x) { int y=fa[x],z=fa[y],p=ch[y][1]==x; fa[ch[y][p]=ch[x][p^1]]=y; ch[x][p^1]=y;fa[y]=x,fa[x]=z; if(z) ch[z][ch[z][1]==y]=x; } inline void splay(int x) { for (int y;y=fa[x];rotate(x)) if(fa[y]) rotate((ch[y][0]==x)==(ch[fa[y]][0]==y)?y:x); root=x; } int pn,pp,ss,sn; inline void pre(int x) { int now=root;pp=0,pn=2100000000; while(1) { if(!now) return; if(data[now]<x&&(x-data[now])<pn) {pp=now;pn=x-data[now];} if(data[now]<x) now=ch[now][1]; else now=ch[now][0]; } } inline void suc(int x) { int now=root;ss=0,sn=2100000000; while(1) { if(!now) return; if(data[now]>x&&(data[now]-x)<sn) {ss=now;sn=data[now]-x;} if(data[now]<x) now=ch[now][1]; else now=ch[now][0]; } } inline void insert(int x,int v) { int y; while(1) { y=ch[x][data[x]<v]; if(!y) { y=++ind; data[y]=v; ch[y][0]=ch[y][1]=0; fa[y]=x;ch[x][data[x]<v]=y; break; } x=y; } splay(y); } inline void del(int x) { splay(x); if(ch[x][0]==0&&ch[x][1]==0) {root=0;return;} if(ch[x][0]==0) {root=ch[x][1];fa[ch[x][1]]=0;return;} if(ch[x][1]==0) {root=ch[x][0];fa[ch[x][0]]=0;return;} int y=ch[x][0]; while(ch[y][1]) y=ch[y][1]; fa[ch[x][0]]=0;splay(y); fa[ch[y][1]=ch[x][1]]=y; root=y; } int n,now,first; int main() { scanf("%d%d%d",&n,&now,&first); root=1;ch[root][0]=ch[root][1]=0; fa[root]=0;data[root]=first; for (int i=2,kind,dat;i<=n;++i) { scanf("%d%d",&kind,&dat); if(root==0) { now=kind; root=++ind;ch[root][0]=ch[root][1]=0; fa[root]=0;data[root]=dat; } else { if(now==kind) insert(root,dat); else { pre(dat);suc(dat); if(pn||sn) { int x=2100000000,xn; if(pn&&pn<x)x=pn,xn=pp; if(sn&&sn<x)x=sn,xn=ss; sum=(sum+x)%1000000; del(xn); } } } } printf("%d\n",sum); return 0; }
2023年4月27日 15:32
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