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| #include <bits/stdc++.h>
using namespace std;
int n,m,r,p,cnt=0,A=0;
int e[423500],hd[423500],nxt[423500];
int tri[423500],lazy[423500];
int wold[423500],wnew[423500];
int f[423500],d[423500],sz[423500];
int hson[423500],rk[423500],top[423500],id[423500];
void buildtree(int x,int l,int r)
{
int mid=(l+r)/2;
if(l==r)
{
tri[x]=wnew[l]%p;
return ;
}
buildtree(2*x,l,mid);
buildtree(2*x+1,mid+1,r);
tri[x]=(tri[2*x]+tri[2*x+1])%p;
}
void pushdown(int x,int l,int r)
{
int mid=(l+r)/2;
if(lazy[x])
{
lazy[2*x]+=lazy[x];
lazy[2*x+1]+=lazy[x];
tri[2*x]+=(mid-l+1)*lazy[x];
tri[2*x+1]+=(r-mid)*lazy[x];
tri[2*x]%=p;
tri[2*x+1]%=p;
lazy[x]=0;
}
}
void update(int x,int l,int r,int a,int b,int k)
{
int mid=(l+r)/2;
if(a<=l&&r<=b)
{
lazy[x]+=k;
tri[x]+=k*(r-l+1);
}
else
{
pushdown(x,l,r);
if(a<=mid) update(2*x,l,mid,a,b,k);
if(b>mid) update(2*x+1,mid+1,r,a,b,k);
tri[x]=tri[x*2]+tri[x*2+1];
}
}
void visit(int x,int l,int r,int a,int b)
{
int mid=(l+r)/2;
if(a<=l&&r<=b)
{
A+=tri[x];
A%=p;
return;
}
pushdown(x,l,r);
if(a<=mid) visit(2*x,l,mid,a,b);
if(b>mid) visit(2*x+1,mid+1,r,a,b);
}
void dfs1(int x,int F,int D)
{
d[x]=D,f[x]=F,sz[x]=1;
int maxx=-1,k=hd[x];
while(k)
{
if(e[k]-F)
{
dfs1(e[k],x,D+1);
sz[x]+=sz[e[k]];
if(sz[e[k]]>maxx)
{
maxx=sz[wold[k]];
hson[x]=e[k];
}
}
k=nxt[k];
}
}
void dfs2(int x,int T)
{
top[x]=T,id[x]=++cnt,rk[cnt]=x;
wnew[cnt]=wold[x];
if(!hson[x]) return;
dfs2(hson[x],T);
int k=hd[x];
while(k)
{
if(e[k]-hson[x]&&e[k]-f[x]) dfs2(e[k],e[k]);
k=nxt[k];
}
}
void updrange(int x,int y,int k)
{
k%=p;
while(top[x]-top[y])
{
if(d[top[x]]<d[top[y]]) swap(x,y);
update(1,1,n,id[top[x]],id[x],k);
x=f[top[x]];
}
if(d[x]>d[y]) swap(x,y);
update(1,1,n,id[x],id[y],k);
}
int qrange(int x,int y)
{
int rns=0;
while(top[x]-top[y])
{
if(d[top[x]]<d[top[y]]) swap(x,y);
A=0;
visit(1,1,n,id[top[x]],id[x]);
rns+=A,rns%=p;
x=f[top[x]];
}
if(d[x]>d[y]) swap(x,y);
A=0;
visit(1,1,n,id[x],id[y]);
rns+=A;
return rns%p;
}
int qson(int x)
{
A=0;
visit(1,1,n,id[x],id[x]+sz[x]-1);
return A;
}
int updson(int x,int k)
{
update(1,1,n,id[x],id[x]+sz[x]-1,k);
}
int main()
{
int i,j,k=0;
scanf("%d%d%d%d",&n,&m,&r,&p);
for(i=1;i<=n;i++) scanf("%d",&wold[i]);
for(i=1;i<=n-1;i++)
{
int x,y;scanf("%d%d",&x,&y);
e[++k]=y,nxt[k]=hd[x],hd[x]=k;
e[++k]=x,nxt[k]=hd[y],hd[y]=k;
}
dfs1(r,0,1);
dfs2(r,r);
buildtree(1,1,n);
int tipic,x,y,z;
while(m--)
{
scanf("%d",&tipic);
switch(tipic)
{
case 1:
{
scanf("%d%d%d",&x,&y,&z);
updrange(x,y,z);
break;
}
case 2:
{
scanf("%d%d",&x,&y);
printf("%d\n",qrange(x,y));
break;
}
case 3:
{
scanf("%d%d",&x,&y);
updson(x,y);
break;
}
case 4:
{
scanf("%d",&x);
printf("%d\n",qson(x));
break;
}
default:break;
}
}
return 0;
}
|