【国家集训队2012】tree(伍一鸣)

Description
一棵n个点的树,每个点的初始权值为1。对于这棵树有q个操作,每个操作为以下四种操作之一: 
+ u v c:将u到v的路径上的点的权值都加上自然数c; 
- u1 v1 u2 v2:将树中原有的边(u1,v1)删除,加入一条新边(u2,v2),保证操作完之后仍然是一棵树; 
* u v c:将u到v的路径上的点的权值都乘上自然数c; 
/ u v:询问u到v的路径上的点的权值和,求出答案对于51061的余数。

Input
第一行两个整数n,q 
接下来n-1行每行两个正整数u,v,描述这棵树 
接下来q行,每行描述一个操作

Output
对于每个/对应的答案输出一行

Sample Input
3 2 
1 2 
2 3 
* 1 3 4 
/ 1 1


Sample Output
4

Hint
数据规模: 
10%的数据保证,1<=n,q<=2000 
另外15%的数据保证,1<=n,q<=5 * 10^4,没有-操作,并且初始树为一条链 
另外35%的数据保证,1<=n,q<=5 * 10^4,没有-操作 
100%的数据保证,1<=n,q<=10^5,0<=c<=10^4


正解:link-cut tree。

毒瘤数据结构题,调了我一下午。。主要是加和乘的lazy标记,下放时如果是乘,那么加的那个标记也要同乘,并且要先下放乘的标记,再下放加的标记。

 

  1 //It is made by wfj_2048~
  2 #include <algorithm>
  3 #include <iostream>
  4 #include <cstring>
  5 #include <cstdlib>
  6 #include <cstdio>
  7 #include <vector>
  8 #include <cmath>
  9 #include <queue>
 10 #include <stack>
 11 #include <map>
 12 #include <set>
 13 #define inf (1<<30)
 14 #define r64 (51061)
 15 #define N (100010)
 16 #define il inline
 17 #define RG register
 18 #define uint unsigned int
 19 #define File(s) freopen(s".in","r",stdin),freopen(s".out","w",stdout)
 20 
 21 using namespace std;
 22 
 23 uint ch[N][2],fa[N],size[N],lazy[N],st[N],rev1[N],rev2[N],val[N],sum[N],n,q;
 24 char s[5];
 25 
 26 il uint gi(){
 27     RG uint x=0,q=1; RG char ch=getchar(); while ((ch<'0' || ch>'9') && ch!='-') ch=getchar();
 28     if (ch=='-') q=-1,ch=getchar(); while (ch>='0' && ch<='9') x=x*10+ch-48,ch=getchar(); return q*x;
 29 }
 30 
 31 il void pushdown(RG uint x){
 32     RG uint &l=ch[x][0],&r=ch[x][1];
 33     if (lazy[x]) lazy[x]=0,lazy[l]^=1,lazy[r]^=1,swap(l,r);
 34     if (rev2[x]!=1){
 35     (val[l]*=rev2[x])%=r64,(val[r]*=rev2[x])%=r64;
 36     (sum[l]*=rev2[x])%=r64,(sum[r]*=rev2[x])%=r64;
 37     (rev1[l]*=rev2[x])%=r64,(rev1[r]*=rev2[x])%=r64;
 38     (rev2[l]*=rev2[x])%=r64,(rev2[r]*=rev2[x])%=r64,rev2[x]=1;
 39     }
 40     if (rev1[x]){
 41     (val[l]+=rev1[x])%=r64,(val[r]+=rev1[x])%=r64;
 42     (sum[l]+=rev1[x]*(size[l]%r64))%=r64,(sum[r]+=rev1[x]*(size[r]%r64))%=r64;
 43     (rev1[l]+=rev1[x])%=r64,(rev1[r]+=rev1[x])%=r64,rev1[x]=0;
 44     }
 45     return;
 46 }
 47 
 48 il void pushup(RG uint x){
 49     sum[x]=(sum[ch[x][0]]+sum[ch[x][1]]+val[x])%r64;
 50     size[x]=size[ch[x][0]]+size[ch[x][1]]+1; return;
 51 }
 52 
 53 il uint isroot(RG uint x){ return ch[fa[x]][0]!=x && ch[fa[x]][1]!=x; }
 54 
 55 il void rotate(RG uint x){
 56     RG uint y=fa[x],z=fa[y],k=ch[y][0]==x; if (!isroot(y)) ch[z][ch[z][1]==y]=x; fa[x]=z;
 57     ch[y][k^1]=ch[x][k],fa[ch[x][k]]=y,ch[x][k]=y,fa[y]=x,pushup(y),pushup(x); return;
 58 }
 59 
 60 il void splay(RG uint x){
 61     RG uint top=0; st[++top]=x;
 62     for (RG uint i=x;!isroot(i);i=fa[i]) st[++top]=fa[i];
 63     while (top) pushdown(st[top--]);
 64     while (!isroot(x)){
 65     RG uint y=fa[x],z=fa[y];
 66     if (!isroot(y)){ if ((ch[z][0]==y)^(ch[y][0]==x)) rotate(x); else rotate(y); }
 67     rotate(x);
 68     }
 69     return;
 70 }
 71 
 72 il void access(RG uint x){ RG uint t=0; while (x) splay(x),ch[x][1]=t,pushup(x),t=x,x=fa[x]; return; }
 73 
 74 il void split(RG uint x){ access(x),splay(x); return; }
 75 
 76 il void makeroot(RG uint x){ split(x),lazy[x]^=1; return; }
 77 
 78 il void link(RG uint x,RG uint y){ makeroot(x),fa[x]=y; return; }
 79 
 80 il void cut(RG uint x,RG uint y){ makeroot(x),split(y),ch[y][0]=fa[x]=0,pushup(y); return; }
 81 
 82 il void add(RG uint x,RG uint y,RG uint v){
 83     makeroot(x),split(y),(rev1[y]+=v)%=r64,(val[y]+=v)%=r64,(sum[y]+=v*(size[y]%r64))%=r64; return;
 84 }
 85 
 86 il void times(RG uint x,RG uint y,RG uint v){
 87     makeroot(x),split(y),(rev1[y]*=v)%=r64,(rev2[y]*=v)%=r64,(val[y]*=v)%=r64,(sum[y]*=v)%=r64; return;
 88 }
 89 il uint query(RG uint x,RG uint y){ makeroot(x),split(y); return sum[y]; }
 90 
 91 il void work(){
 92     n=gi(),q=gi(); RG uint u,v,c; for (RG uint i=1;i<=n;++i) sum[i]=val[i]=rev2[i]=size[i]=1;
 93     for (RG uint i=1;i<n;++i) u=gi(),v=gi(),link(u,v);
 94     for (RG uint i=1;i<=q;++i){
 95     scanf("%s",s); if (s[0]=='+') u=gi(),v=gi(),c=gi(),add(u,v,c);
 96     if (s[0]=='-') u=gi(),v=gi(),cut(u,v),u=gi(),v=gi(),link(u,v);
 97     if (s[0]=='*') u=gi(),v=gi(),c=gi(),times(u,v,c);
 98     if (s[0]=='/'){ u=gi(),v=gi(); printf("%u\n",query(u,v)); }
 99     }
100     return;
101 }
102 
103 int main(){
104     File("tree");
105     work();
106     return 0;
107 }

 

posted @ 2017-02-19 16:56  wfj_2048  阅读(173)  评论(0编辑  收藏  举报