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| #include<bits/stdc++.h>
using namespace std;
#define N 5000006
int head[N],nxt[N],to[N],cntt=0;
int val[N];
int root,n,m,size[N],vis[N],msize[N],tot;
int fa[N][20],dep[N];
inline int read(){
int x=0,f=1;
char ch=getchar();
while(ch<'0'||ch>'9'){
if(ch=='-')
f=-1;
ch=getchar();
}
while(ch>='0'&&ch<='9'){
x=(x<<1)+(x<<3)+(ch^48);
ch=getchar();
}
return x*f;
}
void dfs(register int x,register int f)
{
fa[x][0]=f;
for(register int i=head[x];i;i=nxt[i])
{
register int u=to[i];
if(u==f) continue;
dep[u]=dep[x]+1;dfs(u,x);
}
}
int lca(int x, int y) {
if (dep[x] < dep[y]) swap(x, y);
for (int i = 17; ~i; i--)
if (dep[x] - (1 << i) >= dep[y]) x = fa[x][i];
if (x == y) return x;
for (int i = 17; ~i; i--)
if (fa[x][i] != fa[y][i]) x = fa[x][i], y = fa[y][i];
return fa[x][0];
}
int getdis(register int u,register int v)
{
return dep[u]+dep[v]-(dep[lca(u,v)]<<1);
}
void findcent(register int x,register int f,register int tot)
{
size[x]=1,msize[x]=0;
for(register int i=head[x];i;i=nxt[i])
{
register int v=to[i];
if(v==f||vis[v]) continue;
findcent(v,x,tot);
msize[x]=max(msize[x],size[v]);
size[x]+=size[v];
}
msize[x]=max(msize[x],tot-size[x]);
if(msize[x]<msize[root]) root=x;
}
int dfa[N+5];
void divrt(register int x,register int tot)
{
vis[x]=1;
for(register int i=head[x];i;i=nxt[i])
{
register int v=to[i];
if(vis[v]) continue;
root=0;
register int sz=(size[v]<size[x])?size[x]:(tot-size[x]);
findcent(v,x,sz);
dfa[root]=x;
divrt(root,sz);
}
}
struct segtree
{
int rt[N],ncnt=0;
struct node
{
int ch[2],val;
}tr[N];
void change(register int &x,register int l,register int r,register int p,register int k)
{
if(!x) x=++ncnt;
if(l==r)
{
tr[x].val+=k;
return;
}
register int mid=(l+r)>>1;
if(p<=mid) change(tr[x].ch[0],l,mid,p,k);
else change(tr[x].ch[1],mid+1,r,p,k);
tr[x].val=tr[tr[x].ch[0]].val+tr[tr[x].ch[1]].val;
}
int query(register int x,register int l,register int r,register int ql,register int qr)
{
if(!x) return 0;
if(ql<=l&&r<=qr) return tr[x].val;
register int mid=(l+r)>>1;
register int ret=0;
if(ql<=mid) ret+=query(tr[x].ch[0],l,mid,ql,qr);
if(mid<qr) ret+=query(tr[x].ch[1],mid+1,r,ql,qr);
return ret;
}
}w1,w2;
void change(register int x,register int k)
{
register int cur=x;
while(cur)
{
w1.change(w1.rt[cur],0,n-1,getdis(cur,x),k);
if(dfa[cur]) w2.change(w2.rt[cur],0,n-1,getdis(dfa[cur],x),k);
cur=dfa[cur];
}
}
int query(register int x,register int k)
{
register int cur=x,pre=0,ret=0;
while(cur)
{
if(getdis(cur,x)>k)
{
pre=cur;
cur=dfa[cur];
continue;
}
ret+=w1.query(w1.rt[cur],0,n-1,0,k-getdis(cur,x));
if(pre) ret-=w2.query(w2.rt[pre],0,n-1,0,k-getdis(cur,x));
pre=cur;
cur=dfa[cur];
}
return ret;
}
int main()
{
n=read();m=read();
tot=n;
for(register int i=1;i<=n;i++)
val[i]=read();
for(register int i=1;i<=n-1;i++)
{
register int x,y;
x=read();y=read();
nxt[++cntt]=head[x];
head[x]=cntt;
to[cntt]=y;
nxt[++cntt]=head[y];
head[y]=cntt;
to[cntt]=x;
}
dfs(1,0);
for(register int i=1;i<=19;i++)
for(register int j=1;j<=n;j++)
fa[j][i]=fa[fa[j][i-1]][i-1];
root=0;
msize[0]=0x3fffffff;
findcent(1,0,n);
divrt(root,n);
for(register int i=1;i<=n;i++)
change(i,val[i]);
register int preans=0;
while(m--)
{
register int opt,x,y;
opt=read(),x=read(),y=read();
x^=preans;
y^=preans;
if(opt==0)
{
preans=query(x,y);
printf("%d\n",preans);
}
else
{
change(x,y-val[x]);
val[x]=y;
}
}
return 0;
}
|
