版权声明:转载请声明出处,谢谢配合。 https://blog.csdn.net/zxyoi_dreamer/article/details/82974172
DarkBZOJ传送门
解析:
其实就是这道题放到了 上来做,其实操作基本都是一样的。
拿来做 的练手题还不错。
代码:
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define re register
#define gc getchar
#define pc putchar
#define cs const
inline
ll getint(){
re ll num;
re char c;
while(!isdigit(c=gc()));num=c^48;
while(isdigit(c=gc()))num=(num<<1)+(num<<3)+(c^48);
return num;
}
inline
void outint(int a){
static char ch[23];
if(a==0)pc('0');
while(a)ch[++ch[0]]=a-a/10*10,a/=10;
while(ch[0])pc(ch[ch[0]--]^48);
}
inline
char getop(){
re char c;
while('+'!=(c=gc())&&'-'!=c&&'*'!=c&&'/'!=c);
return c;
}
cs ll mod=51061;
typedef struct splay_node *point;
struct splay_node{
point son[2],fa;
bool tag;
int mul,add,sum,val,siz;
splay_node(){
siz=1;
son[0]=son[1]=fa=NULL;
tag=add=0;
mul=sum=val=1;
}
point &lc(){return son[0];}
point &rc(){return son[1];}
bool isroot(){return !fa||(fa->son[0]!=this&&fa->son[1]!=this);}
bool which(){return fa->son[1]==this;}
void pushnow(int Mul,int Add){
sum=(1ll*sum*Mul%mod+siz*Add%mod)%mod;
val=(1ll*val*Mul%mod+Add)%mod;
add=(1ll*add*Mul%mod+Add)%mod;
mul=1ll*mul*Mul%mod;
}
void pushdown(){
if(tag){
swap(son[0],son[1]);
if(son[0])son[0]->tag^=1;
if(son[1])son[1]->tag^=1;
tag=0;
}
if(mul!=1||add){
if(son[0])son[0]->pushnow(mul,add);
if(son[1])son[1]->pushnow(mul,add);
mul=1,add=0;
}
}
void pushup(){
siz=(son[0]?son[0]->siz:0)+(son[1]?son[1]->siz:0)+1;
sum=((son[0]?son[0]->sum:0)+(son[1]?son[1]->sum:0)+val)%mod;
}
};
cs int N=100005;
struct Link_Cut_Tree{
splay_node ttt[N];
void Rotate(point now){
point Fa=now->fa,FA=Fa->fa;
bool pos=now->which();
if(FA&&!Fa->isroot())FA->son[Fa->which()]=now;
Fa->fa=now;
now->fa=FA;
Fa->son[pos]=now->son[!pos];
if(Fa->son[pos])Fa->son[pos]->fa=Fa;
now->son[!pos]=Fa;
Fa->pushup();
now->pushup();
}
void Splay(point now){
static point q[N];
static int qn;
q[qn=1]=now;
for(point Fa=now;!Fa->isroot();Fa=Fa->fa)q[++qn]=Fa->fa;
for(int re i=qn;i;--i)q[i]->pushdown();
for(point Fa;!now->isroot();Rotate(now))
if(!(Fa=now->fa)->isroot())Rotate(Fa->which()==now->which()?Fa:now);
}
void access(point now){
for(point son=NULL;now;son=now,now=now->fa)
Splay(now),now->rc()=son,now->pushup();
}
void makeroot(point now){
access(now),Splay(now);
now->tag^=1;
}
void link(point u,point v){
makeroot(u),u->fa=v;
}
void link(int u,int v){link(&ttt[u],&ttt[v]);}
void cut(point u,point v){
makeroot(u),access(v),Splay(v);
v->lc()=u->fa=NULL;
}
void cut(int u,int v){cut(&ttt[u],&ttt[v]);}
void add(point u,point v,int val){
makeroot(u),access(v),Splay(v);
v->pushnow(1,val);
}
void add(int u,int v,int val){add(&ttt[u],&ttt[v],val);}
void mul(point u,point v,int val){
makeroot(u),access(v),Splay(v);
v->pushnow(val,0);
}
void mul(int u,int v,int val){mul(&ttt[u],&ttt[v],val);}
int query(point u,point v){
makeroot(u);
access(v);
Splay(v);
return v->sum;
}
int query(int u,int v){return query(&ttt[u],&ttt[v]);}
}LCT;
int n,q;
signed main(){
n=getint(),q=getint();
for(int re i=1;i<n;++i){
int u=getint(),v=getint();
LCT.link(u,v);
}
while(q--){
char op=getop();
int u=getint(),v=getint();
switch(op){
case '+':{
int val=getint();
LCT.add(u,v,val);
break;
}
case '-':{
LCT.cut(u,v);
u=getint(),v=getint();
LCT.link(u,v);
break;
}
case '*':{
int val=getint();
LCT.mul(u,v,val);
break;
}
case '/':{
outint(LCT.query(u,v)),pc('\n');
break;
}
}
}
return 0;
}