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#include<cstdio>
#include<cstring>
#include<algorithm>
#include<iostream>
#include<queue>
#include<map>
#include<stack>
#include<cmath>
#include<set>
#include<bitset>
#include<assert.h>
#define inc(i,l,r) for(int i=l;i<=r;i++)
#define dec(i,l,r) for(int i=l;i>=r;i--)
#define link(x) for(edge *j=h[x];j;j=j->next)
#define mem(a) memset(a,0,sizeof(a))
#define ll long long
#define eps 1e-8
#define succ(x) (1<<x)
#define lowbit(x) (x&(-x))
#define sqr(x) ((x)*(x))
#define mid (x+y)/2
#define NM 200005
#define nm 400005
#define pi 3.1415926535897931
using namespace std;
const ll inf=1e18;
ll read(){
ll x=0,f=1;char ch=getchar();
while(!isdigit(ch)){if(ch=='-')f=-1;ch=getchar();}
while(isdigit(ch))x=x*10+ch-'0',ch=getchar();
return f*x;
}
struct edge{int t;edge*next;}e[nm],*h[NM],*o=e;
void add(int x,int y){o->t=y;o->next=h[x];h[x]=o++;}
int n,m,_x,_y;
ll g[NM][2],d[NM][2],a[NM];
int son[NM],c[NM],id[NM],tot,top[NM],TOP,f[NM],end[NM],size[NM];
char _s[5];
multiset<ll>p[NM];
multiset<ll>::iterator it;
void dfs1(int x){
d[x][0]=a[x];
link(x)if(j->t!=f[x]){
f[j->t]=x;
dfs1(j->t);
if(size[j->t]>size[son[x]])son[x]=j->t;
size[x]+=size[j->t];
d[x][0]+=max(d[j->t][0],0ll);
d[x][1]=max(d[x][1],d[j->t][1]);
}
size[x]++;d[x][1]=max(d[x][1],d[x][0]);
}
void dfs2(int x){
top[x]=TOP;id[x]=++tot;c[tot]=x;g[x][0]=a[x];end[x]=x;
if(son[x])dfs2(son[x]),end[x]=end[son[x]];
link(x)if(!top[j->t]){
dfs2(TOP=j->t);
g[x][0]+=max(d[j->t][0],0ll);
p[x].insert(d[j->t][1]);
}
if(p[x].empty()){g[x][1]=g[x][0];return;}
it=p[x].end();it--;
g[x][1]=max(*it,g[x][0]);
}
struct mat{int n,m;ll a[3][3];}one;
mat operator*(const mat&x,const mat&y){
mat s;s.n=x.n;s.m=y.m;inc(i,0,2)inc(j,0,2)s.a[i][j]=-inf;
inc(i,0,s.n)inc(k,0,x.m)if(x.a[i][k]>-inf)inc(j,0,s.m)if(y.a[k][j]>-inf)s.a[i][j]=max(s.a[i][j],x.a[i][k]+y.a[k][j]);
return s;
}
struct node{
node*l,*r;
int x,y;
mat s;
void upd(){s=l->s*r->s;}
node(int x,int y,node*l=0,node*r=0):x(x),y(y),l(l),r(r){
if(x==y){
mem(s.a);s.n=s.m=2;
s.a[0][1]=s.a[2][0]=s.a[2][1]=-inf;
s.a[0][0]=s.a[0][2]=s.a[1][0]=g[c[x]][0];s.a[1][2]=g[c[x]][1];
}else upd();
}
void mod(){
if(x==y){
s.a[0][0]=s.a[0][2]=s.a[1][0]=g[c[x]][0];s.a[1][2]=g[c[x]][1];
return;
}
if(_x<=mid)l->mod();else r->mod();upd();
}
mat sum(){
if(_x<=x&&y<=_y)return s;
if(_x>mid)return r->sum();
if(_y<=mid)return l->sum();
return l->sum()*r->sum();
}
}*root;
node*build(int x,int y){return x==y?new node(x,y):new node(x,y,build(x,mid),build(mid+1,y));}
void ch(int x){
g[x][0]+=_y-a[x];a[x]=_y;
if(!p[x].empty()){
it=p[x].end();it--;
g[x][1]=max(*it,g[x][0]);
}else g[x][1]=g[x][0];
_x=id[x];root->mod();
while(top[x]>1){
x=top[x];
_x=id[x];_y=id[end[x]];mat t=root->sum()*one;
g[f[x]][0]-=max(d[x][0],0ll)-max(t.a[0][0],0ll);
p[f[x]].erase(p[f[x]].lower_bound(d[x][1]));p[f[x]].insert(d[x][1]=t.a[1][0]);
it=p[f[x]].end();it--;
g[f[x]][1]=max(*it,g[f[x]][0]);
d[x][0]=max(t.a[0][0],0ll);
x=f[x];_x=id[x];root->mod();
}
}
int main(){
freopen("data.in","r",stdin);
n=read();m=read();
inc(i,1,n)a[i]=read();
inc(i,2,n){_x=read();_y=read();add(_x,_y);add(_y,_x);}
dfs1(f[1]=1);dfs2(TOP=1);
root=build(1,n);
one.n=2;one.m=0;
while(m--){
scanf("%s",_s);_x=read();
if(_s[0]=='M'){
_y=read();ch(_x);
}else{
_y=id[end[_x]];_x=id[_x];
mat ans=root->sum()*one;
printf("%lld\n",ans.a[1][0]);
}
}
return 0;
}
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