#include <bits/stdc++.h>
using namespace std;

vector<int> zaatu(vector<int> &A){
    vector<int> B = A;
    sort(B.begin(),B.end());
    B.erase(unique(B.begin(),B.end()),B.end());
    
    for(auto &a : A) a = lower_bound(B.begin(),B.end(),a)-B.begin();
    return B;
}
vector<long long> zaatull(vector<long long> &A){
    vector<long long> B = A;
    B.erase(unique(B.begin(),B.end()),B.end());
    
    return B;
}

using SS = int;
class SegmentTree{
    public:
    int siz = 1,n;
    vector<SS> dat;
 
    SS op(SS a, SS b){return a+b;}
    SS e(){return 0;}
    void renew (SS &a,SS x){
        a = op(a,x);
        //a = x;
        //その他.
    }
 
    void make(int N){
        while(siz < N) siz *= 2;
        n = N; dat.resize(siz*2,e());
    }
 
    void make2(int N,vector<SS> &A){
        make(N);
        for(int i=0; i<N; i++){
            int pos = i+siz;
            dat.at(pos) = A.at(i);
        }
        for(int i=siz-1; i>0; i--) dat.at(i) = op(dat.at(i*2),dat.at(i*2+1));
    }
 
    void update(int pos,SS x){
        pos = pos+siz;
        renew(dat.at(pos),x);
        while(pos != 1){
            pos = pos/2;
            dat.at(pos) = op(dat.at(pos*2),dat.at(pos*2+1));
        }
    }
 
    SS findans(int l, int r){
        SS retl = e(),retr = e();
        l += siz,r += siz;
        while(l < r){
            if(l&1) retl = op(retl,dat.at(l++));
            if(r&1) retr = op(dat.at(--r),retr);
            l >>= 1; r >>= 1;
        }
        return op(retl,retr);
    }
 
    SS get(int pos){return dat.at(pos+siz);}
    SS rangeans(int l, int r){return findans(l,r);}
    SS allrange(){return dat.at(1);}
 
    //rightは) leftは[で 渡す&返す. 
    int maxright(const function<bool(SS)> f,int l = 0){
        l += siz; int r = n+siz;
        vector<int> ls,rs;
        while(l < r){
            if(l&1) ls.push_back(l++);
            if(r&1) rs.push_back(--r);
            l >>= 1; r >>= 1; 
        }
        SS okl = e();
        for(int i=0; i<ls.size(); i++){
            l = ls.at(i);
            SS now = op(okl,dat.at(l));
            if(!f(now)){
                while(l < siz){
                    l <<= 1;
                    now = op(okl,dat.at(l));
                    if(f(now)){okl = now; l++;}
                }
                return l-siz;
            } 
            okl = now;
        }
        for(int i=rs.size()-1; i>=0; i--){
            l = rs.at(i);
            SS now = op(okl,dat.at(l));
            if(!f(now)){
                while(l < siz){
                    l <<= 1;
                    now = op(okl,dat.at(l));
                    if(f(now)){okl = now; l++;}
                }
                return l-siz;
            } 
            okl = now;
        }
        return n;
    }
    int minleft(const function<bool(SS)> f,int r = -1){
        if(r == -1) r = n;
        int l = siz; r += siz;
        vector<int> ls,rs;
        while(l < r){
            if(l&1) ls.push_back(l++);
            if(r&1) rs.push_back(--r);
            l >>= 1; r >>= 1; 
        }
        SS okr = e();
        for(int i=0; i<rs.size(); i++){
            r = rs.at(i);
            SS now = op(dat.at(r),okr);
            if(!f(now)){
                while(r < siz){
                    r <<= 1; r++;
                    now = op(dat.at(r),okr);
                    if(f(now)){okr = now; r--;}
                }
                return r+1-siz;
            }
        }
        for(int i=ls.size()-1; i>=0; i--){
            r = ls.at(i);
            SS now = op(dat.at(r),okr);
            if(!f(now)){
                while(r < siz){
                    r <<= 1; r++;
                    now = op(dat.at(r),okr);
                    if(f(now)){okr = now; r--;}
                }
                return r+1-siz;
            }
        }
        return 0;
    }
    //ノーマルセグ木.一年の時を経て漸く二分探索実装した.
};

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N,Q; cin >> N >> Q;
    vector<long long> B(N,-1);
    vector<int> St;
    vector<long long> A(N),all;
    for(auto &a : A) cin >> a;
    all = A;
    vector<tuple<int,long long,long long>> Query(Q,{-1,-1,-1});
    for(auto &[t,k,x] : Query){
        cin >> t;
        if(t == 1) cin >> k >> x,k--,all.push_back(x);
        if(t == 3) cin >> k,k--;
    }
    sort(all.begin(),all.end());
    auto za = zaatull(all);
    int n = za.size();

    for(auto &a : A) a = lower_bound(za.begin(),za.end(),a)-za.begin();
    for(auto &[t,k,x] : Query) if(t == 1) x = lower_bound(za.begin(),za.end(),x)-za.begin();

    SegmentTree Z; Z.make(n);
    for(auto &a : A) Z.update(a,1);

    int border = -1;
    auto f = [&](SS x){return x<border;};

    bool sorted = false;
    for(auto &[t,k,x] : Query){
        if(t == 1){
            St.push_back(k);
            B.at(k) = x;
        }
        if(t == 2){
            sorted = true;
            for(auto pos : St){
                if(B.at(pos) == -1) continue;
                long long a1 = A.at(pos),a2 = B.at(pos);
                Z.update(a1,-1); Z.update(a2,1);
                B.at(pos) = -1;
            }
            St.clear();
        }
        if(t == 3){
            if(B.at(k) != -1) cout << all.at(B.at(k)) << "\n";
            else if(sorted == false) cout << all.at(A.at(k)) << "\n";
            else{
                border = k+1;
                cout << all.at(Z.maxright(f)) << "\n";
            }
        }
    }
}