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| /*
hdu4010
*/
#include<iostream>
#include<cstdio>
#include<cstring>
#include<cstdlib>
using namespace std;
template<typename T>
void Swap(T& a,T& b){T t=a;a=b;b=t;}
template<typename T>
bool read(T& w)
{
char r;int f=1;
for(r=getchar();r!=-1&&r!='-'&&(r<48||r>57);r=getchar());
if(r=='-')r=getchar(),f=-1;
if(r==-1)return false;
for(w=0;r>=48&&r<=57;r=getchar())w=w*10+r-48;
w*=f;
return true;
}
template<typename T>
void write(T w,char c=0)
{
if(w<0)w=-w,putchar('-');
if(w>9)write(w/10);
putchar(w%10+48);
if(c)putchar(c);
}
template<typename T>
T Max(const T& a,const T& b){return a>b?a:b;}
const int maxn=300003;
const int inf=2147483647;
int n,q;
//Splay
int f[maxn],c[maxn][2],maxv[maxn],w[maxn];
bool rev[maxn];
int add[maxn];
#define lc(k) c[k][0]
#define rc(k) c[k][1]
bool isroot(int k)
{
return lc(f[k])!=k&&rc(f[k])!=k;
}
void update(int k)
{
maxv[k]=Max(Max(maxv[lc(k)],maxv[rc(k)]),w[k]);
}
void tagdown(int k)
{
if(rev[k])
{
rev[k]^=1,rev[lc(k)]^=1,rev[rc(k)]^=1;
Swap(lc(k),rc(k));
}
if(add[k])
{
if(lc(k))add[lc(k)]+=add[k],maxv[lc(k)]+=add[k],w[lc(k)]+=add[k];
if(rc(k))add[rc(k)]+=add[k],maxv[rc(k)]+=add[k],w[rc(k)]+=add[k];
add[k]=0;
}
}
void rotate(int x,int& k)
{
int y=f[x],z=f[y];
int l=int(x!=lc(y));
int r=l^1;
if(y==k)k=x;
else
{
if(y==lc(z))lc(z)=x;
else rc(z)=x;
}
f[x]=z,f[y]=x,f[c[x][r]]=y;
c[y][l]=c[x][r],c[x][r]=y;
update(y),update(x);
}
void splay(int x,int& k)
{
while(x!=k)
{
int y=f[x],z=f[y];
if(y!=k)
{
if(x==lc(y) ^ y==lc(z))
rotate(x,k);
else rotate(y,k);
}
rotate(x,k);
}
}
int stk[maxn],top=0;
void Splay(int x)
{
int rt;
for(rt=x;!isroot(rt);rt=f[rt])
stk[++top]=rt;
for(tagdown(rt);top;--top)tagdown(stk[top]);
splay(x,rt);
}
void access(int x)
{
for(int t=0;x;)
{
Splay(x);
rc(x)=t;
update(x);
t=x;x=f[x];
}
}
void mroot(int x)
{
access(x),Splay(x),rev[x]^=1;
}
void link(int x,int y)
{
mroot(x),f[x]=y;
//Splay(x);
}
void cut(int x,int y)
{
mroot(x),access(y),Splay(y),lc(y)=f[lc(y)]=0;//should not used lc(y)=f[x]=0, because we should cut y and its parent
update(y);
}
struct EDGE
{
int to,nxt;
void init(int too,int nxtt)
{
to=too,nxt=nxtt;
}
}edge[maxn<<1];
int ek=0;
int head[maxn];
void addEdge(int k,int v)
{
edge[++ek].init(v,head[k]);
head[k]=ek;
}
void dfs(int k)
{
for(int i=head[k];i;i=edge[i].nxt)
{
int v=edge[i].to;
if(v!=f[k])
{
f[v]=k;
dfs(v);
}
}
}
void Init()
{
ek=0;
maxv[0]=-inf;
for(int i=0;i<=n;++i)
{
f[i]=c[i][0]=c[i][1]=0;
rev[i]=false;
add[i]=0;
head[i]=0;
}
}
void input()
{
for(int i=1,x,y;i<=n-1;++i)
{
read(x),read(y);
addEdge(x,y);
addEdge(y,x);
}
for(int i=1;i<=n;++i)
{
read(w[i]);
maxv[i]=w[i];
}
dfs(1);
}
int findroot(int x)
{
access(x),Splay(x);
while(lc(x))x=lc(x);
return x;
}
inline bool insame(int x,int y)
{
return findroot(x)==findroot(y);
}
void solve()
{
int cmd,x,y,ww;
bool illegal;
for(read(q);q;--q)
{
illegal=false;
read(cmd);
if(cmd==1)
{
read(x),read(y);
if(insame(x,y))illegal=true;
else link(x,y);
}
else if(cmd==2)
{
read(x),read(y);
if(x==y||!insame(x,y))illegal=true;
else cut(x,y);
}
else if(cmd==3)
{
read(ww),read(x),read(y);
if(!insame(x,y))illegal=true;
else
{
mroot(x);
access(y),Splay(y);
w[y]+=ww,maxv[y]+=ww,add[y]+=ww;
}
}
else if(cmd==4)
{
read(x),read(y);
if(!insame(x,y))illegal=true;
else
{
mroot(x);
access(y),Splay(y);
write(maxv[y],'\n');
}
}
if(illegal)puts("-1");
}
}
int main()
{
freopen("hdu4010_1.in","r",stdin);
//freopen("hdu4010.out","w",stdout);
while(read(n))
{
Init();
input();
solve();
putchar('\n');
}
return 0;
}
|
