链接:lg3178[维护点权]
题解
- 维护点权,模板
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using namespace std;
const int N=1e6;
ll rt[N],lz[N],id[N],top[N],hson[N],size[N],deep[N],w[N],wt[N],f[N];
int head[N],nxt[N],to[N];
ll n,m,cnt,op,a,b;
inline void adde(int u,int v){nxt[++cnt]=head[u];to[cnt]=v;head[u]=cnt;}
inline void pushup(int o){rt[o]=rt[o<<1]+rt[o<<1|1];}
inline void pushdown(int o,int len){
if(!lz[o])return ;
lz[o<<1]+=lz[o];
lz[o<<1|1]+=lz[o];
rt[o<<1]+=lz[o]*(len-(len>>1));
rt[o<<1|1]+=lz[o]*(len>>1);
lz[o]=0;
}
inline void build(int o,int l,int r){
if(l==r){rt[o]=w[l];return ;}
int mid=l+r>>1;
build(lson);
build(rson);
pushup(o);
}
inline void update(int o,int l,int r,int L,int R,ll x){
if(L<=l&&R>=r){rt[o]+=(r-l+1)*x;lz[o]+=x;return ;}
pushdown(o,r-l+1);
int mid=l+r>>1;
if(L<=mid)update(lson,L,R,x);
if(R>mid)update(rson,L,R,x);
pushup(o);
}
inline ll query(int o,int l,int r,int L,int R){
if(L<=l&&R>=r)return rt[o];
pushdown(o,r-l+1);
int mid=l+r>>1;
ll ans=0;
if(L<=mid)ans+=query(lson,L,R);
if(R>mid)ans+=query(rson,L,R);
return ans;
}
inline void dfs1(int x){
size[x]=1;
for(int i=head[x];i;i=nxt[i])if(to[i]!=f[x]){
f[to[i]]=x;
deep[to[i]]=deep[x]+1;
dfs1(to[i]);
size[x]+=size[to[i]];
if(size[hson[x]]<size[to[i]])hson[x]=to[i];
}
}
inline void dfs2(int x,int t){
top[x]=t;id[x]=++cnt;w[cnt]=wt[x];
if(hson[x])dfs2(hson[x],t);
for(int i=head[x];i;i=nxt[i])if(to[i]!=f[x]&&to[i]!=hson[x])dfs2(to[i],to[i]);
}
inline ll queryrange(int x,int y){
ll ans=0;
while(top[x]!=top[y]){
if(deep[top[x]]<deep[top[y]])swap(x,y);
ans+=query(1,1,n,id[top[x]],id[x]);
x=f[top[x]];
}
if(deep[x]>deep[y])swap(x,y);
return ans+query(1,1,n,id[x],id[y]);
}
int main(){
scanf("%d%d",&n,&m);
rep(i,1,n)scanf("%lld",&wt[i]);
rep(i,2,n){scanf("%d%d",&a,&b);adde(a,b);adde(b,a);}
cnt=0;
dfs1(1);
dfs2(1,1);
build(1,1,n);
while(m--){
scanf("%d%lld",&op,&a);
if(op==1){scanf("%lld",&b);update(1,1,n,id[a],id[a],b);}
else if(op==2){scanf("%lld",&b);update(1,1,n,id[a],id[a]+size[a]-1,b);}
else printf("%lld\n",queryrange(1,a));
}
return 0;
}