auto_iterator @ 2023-05-13 09:33:32
#include<bits/stdc++.h>
#define int long long
using namespace std;
const int N=2e5+5;
int arr[N];
int dep[N];
int dfn[N];
int size[N];
int fa[N];
int wc[N];
int rdfn[N];
int top[N];
int mod;
int n,m,r;
int vs=0;
vector<int>v[N];
struct sd {
int l,r;
int val;
int lazytag;
} T[4*N];
void dfs1(int u,int f) {
fa[u]=f;
size[u]=1;
dep[u]=dep[f]+1;
for(int i=0; i<v[u].size(); i++) {
int k=v[u][i];
if(k==f)continue;
dfs1(k,u);
size[u]+=size[k];
if(size[k]>size[wc[u]])wc[u]=k;
}
}
void dfs2(int u,int Top) {
dfn[u]=++vs;
rdfn[vs]=u;
top[u]=Top;
if(wc[u]!=0) {
dfs2(wc[u],Top);
for(int i=0; i<v[u].size(); i++) {
if(v[u][i]!=fa[u]&&v[u][i]!=wc[u])dfs2(v[u][i],v[u][i]);
}
}
else return ;
}
bool IR(int L,int R,int l,int r) {
return l<=L&&R<=r;
}
bool OR(int L,int R,int l,int r) {
return L>r||R<l;
}
void maketag(int cnt,int len,int data) {
T[cnt].lazytag +=data;
T[cnt].val +=len*data%mod;
T[cnt].lazytag %=mod;
T[cnt].val %=mod;
}
void pushup(int cnt) {
T[cnt].val =(T[cnt*2].val +T[cnt*2+1].val)%mod;
}
void pushdown(int l,int r,int cnt)
{
int mid=(l+r)/2;
maketag(cnt*2,mid-l+1,T[cnt].lazytag );
maketag(cnt*2+1,r-mid,T[cnt].lazytag );
T[cnt].lazytag =0;
}
void update(int L,int R,int l,int r,int cnt,int data) {
if(IR(L,R,l,r)) {
maketag(cnt,r-l+1,data);
} else if(!(OR(L,R,l,r))) {
int mid=(L+R)/2;
pushdown(L,R,cnt);
update(L,mid,l,r,cnt*2,data);
update(mid+1, R, l, r, cnt*2+1, data);
pushup( cnt);
}
}
void build(int l,int r,int cnt) {
if(l==r) {
T[cnt].val=arr[rdfn[l]];
T[cnt].l =l;
T[cnt].r =r;
return ;
}
int mid=(l+r)/2;
build(l,mid,cnt*2);
build(mid+1,r,cnt*2+1);
pushup(cnt);
}
int q1(int L,int R,int l,int r,int cnt){
if(IR(L,R,l,r)){
return T[cnt].val%mod ;
}else if(!OR(L,R,l,r)){
int mid=(L+R)/2;
pushdown(L,R,cnt);
return (q1(L,mid,l,r,cnt*2)+q1(mid+1,R,l,r,cnt*2+1))%mod;
}else return 0;
}
void upd(int x,int y,int z) {
while(top[x]!=top[y]) {
if(dep[top[x]]<dep[top[y]])swap(x,y);
update(1,n,dfn[top[x]],dfn[x],1,z);
x=fa[top[x]];
}
update(1,n,min(dfn[x],dfn[y]),max(dfn[x],dfn[y]),1,z);
}
int q(int x,int y) {
int ans=0;
while(top[x]!=top[y])
{
if(dep[top[x]]<dep[top[y]])swap(x,y);
ans+=q1(1,n,dfn[top[x]],dfn[x],1);
ans%=mod;
x=fa[top[x]];
}
ans+=q1(1,n,min(dfn[x],dfn[y]),max(dfn[x],dfn[y]),1);
return ans%mod;
}
signed main() {
// freopen("qwq.in","r",stdin);
// freopen("me.out","w",stdout);
cin >> n >> m >> r >> mod;
for(int i=1; i<=n; i++) {
cin >> arr[i];
}
for(int i=1; i<n; i++) {
int x,y;
cin >> x >> y;
v[x].push_back(y);
v[y].push_back(x);
}
dfs1(r,0);
dfs2(r,r);
build(1,n,1);
for(int i=1; i<=m; i++) {
int flag;
cin >> flag;
if(flag==1) {
int x,y,z;
cin >> x >> y >> z;
upd(x,y,z);
}
if(flag==2) {
int x,y;
cin >> x >> y;
cout << q(x,y)%mod;
puts("");
}
if(flag==3) {
int x,y;
update(1,n,dfn[x],dfn[x]+size[x]-1,1,y);
}
if(flag==4){
int x;
cin >> x;
cout << q1(1,n,dfn[x],dfn[x]+size[x]-1,1)%mod;
puts("");
}
}
// debug();
return 0;
}
by _Imaginary_ @ 2023-05-13 10:15:25
T[cnt].val +=len*data%mod;
建议改成
T[cnt].val +=1ll*len*data%mod;
by auto_iterator @ 2023-05-13 10:20:07
@Birdly
by auto_iterator @ 2023-05-13 10:22:27
@Imaginary 感谢,还有别的地方吗
by auto_iterator @ 2023-05-13 10:43:12
@Mxq0602