1 #include<cstdio>
2 #include<algorithm>
3 #define N 500010
4 #define rg register
5 #define ls (c[u][0])
6 #define rs (c[u][1])
7 using namespace std;
8 int n,m,x,y,opt,top,val[N],c[N][2],fa[N],xr[N],st[N],rev[N];
9 inline int read(){
10 int k=0,f=1; char c=getchar();
11 while(c<'0'||c>'9')c=='-'&&(f=-1),c=getchar();
12 while('0'<=c&&c<='9')k=k*10+c-'0',c=getchar();
13 return k*f;
14 }
15 inline bool isroot(int u){
16 return c[fa[u]][0]!=u&&c[fa[u]][1]!=u;
17 }
18 inline bool which(int u){
19 return c[fa[u]][1]==u;
20 }
21 inline void pushup(int u){
22 xr[u]=xr[ls]^xr[rs]^val[u];
23 }
24 inline void pushdown(int u){
25 rev[ls]^=1; rev[rs]^=1; rev[u]=0; swap(ls,rs);
26 }
27 void rotate(int u){
28 int f=fa[u],gf=fa[f],wh=which(u);
29 if(!isroot(f)) c[gf][which(f)]=u;
30 fa[u]=gf; fa[f]=u; fa[c[u][wh^1]]=f;
31 c[f][wh]=c[u][wh^1]; c[u][wh^1]=f;
32 pushup(f); pushup(u);
33 }
34 void splay(int u){
35 st[top=1]=u;
36 for(rg int i=u;!isroot(i);i=fa[i]) st[++top]=fa[i];
37 for(rg int i=top;i;i--) if(rev[st[i]]) pushdown(st[i]);
38 while(!isroot(u)){
39 if(!isroot(fa[u])) rotate(which(u)==which(fa[u])?fa[u]:u);
40 rotate(u);
41 }
42 }
43 inline void access(int u){
44 for(rg int son=0;u;son=u,u=fa[u]) splay(u),c[u][1]=son,pushup(u);
45 }
46 inline void makeroot(int u){
47 access(u); splay(u); rev[u]^=1;
48 }
49 int find(int u){
50 access(u); splay(u);
51 while(ls) u=ls; return u;
52 }
53 void split(int x,int y){
54 makeroot(x); access(y); splay(y);
55 }
56 void cut(int x,int y){
57 split(x,y); bool goright=0;
58 int t=c[y][0];
59 while(c[t][1]) t=c[t][1],goright=1;
60 if(t==x&&goright) c[fa[t]][1]=0,fa[x]=0;
61 if(t==x&&(!goright)) c[y][0]=0,fa[x]=0;
62 }
63 void link(int x,int y){
64 makeroot(x); fa[x]=y;
65 }
66 int main(){
67 n=read(); m=read();
68 for(rg int i=1;i<=n;i++) val[i]=xr[i]=read();
69 while(m--){
70 opt=read(); x=read(); y=read();
71 if(opt==0) split(x,y),printf("%d\n",xr[y]);
72 if(opt==1) if(find(x)!=find(y))link(x,y);
73 if(opt==2) if(find(x)==find(y)) cut(x,y);
74 if(opt==3) access(x),splay(x),val[x]=y,pushup(x);
75 }
76 return 0;
77 }
