#include<bits/stdc++.h>
using namespace std;
#define REP(i,n)for(int i=0;i<(n);++i)
#define REP1(i,n)for(int i=1;i<=(n);++i)
#define FORE(...)for(auto&&__VA_ARGS__)
#define ALL(x)begin(x),end(x)
#define mset(x,y)memset(x,y,sizeof x)
#define pb push_back
#define eb emplace_back
#define V vector
#define lb(x,y)(lower_bound(begin(x),end(x),y)-begin(x))
#define ub(x,y)(upper_bound(begin(x),end(x),y)-begin(x))
template<class T,class S>inline bool chmin(T&A,S B){return A>B?A=B,1:0;}
template<class T,class S>inline bool chmax(T&A,S B){return A<B?A=B,1:0;}
void fastIO(){ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);}
using Int=long long;
using Real=long double;
using PII=pair<int,int>;
using PLL=pair<Int,Int>;
#include<atcoder/segtree>
int OP(int a,int b){return a+b;}
int E(){return 0;}
int main(){
	fastIO();
	int N,Q;cin>>N>>Q;
	Int A[N];
	REP(i,N)cin>>A[i];
	int li[N];
	mset(li,-1);
	int ls=-1;
	int op[Q],k[Q];Int x[Q];
	REP(i,Q){
		cin>>op[i];
		if(op[i]==1)cin>>k[i]>>x[i],--k[i];
		if(op[i]==3)cin>>k[i],--k[i];
	}
	V<Int>vs;
	REP(i,N)vs.pb(A[i]);
	REP(i,Q)if(op[i]==1)vs.pb(x[i]);
	sort(ALL(vs));
	vs.erase(unique(ALL(vs)),end(vs));
	atcoder::segtree<int,OP,E>ST(size(vs));
	REP(i,N){
		int id=lb(vs,A[i]);
		ST.set(id,ST.get(id)+1);
	}
	REP(i,Q){
		if(op[i]==1){
			int id=lb(vs,A[k[i]]);
			ST.set(id,ST.get(id)-1);
			id=lb(vs,x[i]);
			ST.set(id,ST.get(id)+1);
			A[k[i]]=x[i];
			li[k[i]]=i;
		}
		if(op[i]==2){
			ls=i;
		}
		if(op[i]==3){
			if(li[k[i]]>=ls){
				cout<<A[k[i]]<<"\n";
			}else{
				cout<<vs[ST.max_right(0,[&](int semi){return semi<k[i]+1;})]<<"\n";
			}
		}
	}
}