#line 1 "test.cpp"
#include<bits/stdc++.h>
//#pragma GCC target("avx,avx2")
//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
#ifdef LOCAL
#include <debug.hpp>
#define debug(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#define debug(...) (static_cast<void>(0))
#endif
using namespace std;
using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pll = pair<ll,ll>;
using pii = pair<int,int>;
using vi = vector<int>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vvvl = vector<vvl>;
using vul = vector<ull>;
using vpii = vector<pii>;
using vvpii = vector<vpii>;
using vpll = vector<pll>;
using vs = vector<string>;
template<class T> using pq = priority_queue<T,vector<T>, greater<T>>;
#define overload4(_1, _2, _3, _4, name, ...) name
#define overload3(a,b,c,name,...) name
#define rep1(n) for (ll UNUSED_NUMBER = 0; UNUSED_NUMBER < (n); ++UNUSED_NUMBER)
#define rep2(i, n) for (ll i = 0; i < (n); ++i)
#define rep3(i, a, b) for (ll i = (a); i < (b); ++i)
#define rep4(i, a, b, c) for (ll i = (a); i < (b); i += (c))
#define rep(...) overload4(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)
#define rrep1(n) for(ll i = (n) - 1;i >= 0;i--)
#define rrep2(i,n) for(ll i = (n) - 1;i >= 0;i--)
#define rrep3(i,a,b) for(ll i = (b) - 1;i >= (a);i--)
#define rrep4(i,a,b,c) for(ll i = (a) + ((b)-(a)-1) / (c) * (c);i >= (a);i -= c)
#define rrep(...) overload4(__VA_ARGS__, rrep4, rrep3, rrep2, rrep1)(__VA_ARGS__)
#define all1(i) begin(i) , end(i)
#define all2(i,a) begin(i) , begin(i) + a
#define all3(i,a,b) begin(i) + a , begin(i) + b
#define all(...) overload3(__VA_ARGS__, all3, all2, all1)(__VA_ARGS__)
#define sum(...) accumulate(all(__VA_ARGS__),0LL)
template<class T> bool chmin(T &a, const T &b){ if(a > b){ a = b; return 1; } else return 0; }
template<class T> bool chmax(T &a, const T &b){ if(a < b){ a = b; return 1; } else return 0; }
template<class T> auto min(const T& a){return *min_element(all(a));}
template<class T> auto max(const T& a){return *max_element(all(a));}
template<class... Ts> void in(Ts&... t);
#define INT(...) int __VA_ARGS__; in(__VA_ARGS__)
#define LL(...) ll __VA_ARGS__; in(__VA_ARGS__)
#define STR(...) string __VA_ARGS__; in(__VA_ARGS__)
#define CHR(...) char __VA_ARGS__; in(__VA_ARGS__)
#define DBL(...) double __VA_ARGS__; in(__VA_ARGS__)
#define LD(...) ld __VA_ARGS__; in(__VA_ARGS__)
#define VEC(type, name, size) vector<type> name(size); in(name)
#define VV(type, name, h, w) vector<vector<type>> name(h, vector<type>(w)); in(name)
ll intpow(ll a, ll b){ ll ans = 1; while(b){if(b & 1) ans *= a; a *= a; b /= 2;} return ans;}
ll modpow(ll a, ll b, ll p){ ll ans = 1; a %= p;if(a < 0) a += p;while(b){ if(b & 1) (ans *= a) %= p; (a *= a) %= p; b /= 2; } return ans; }
bool is_clamp(ll val,ll low,ll high) {return low <= val && val < high;}
void Yes() {cout << "Yes\n";return;}
void No() {cout << "No\n";return;}
void YES() {cout << "YES\n";return;}
void NO() {cout << "NO\n";return;}
template <typename T>
T floor(T a, T b) {return a / b - (a % b && (a ^ b) < 0);}
template <typename T>
T ceil(T x, T y) {return floor(x + y - 1, y);}
template <typename T>
T bmod(T x, T y) {return x - y * floor(x, y);}
template <typename T>
pair<T, T> divmod(T x, T y) {T q = floor(x, y);return {q, x - q * y};}
namespace IO{
#define VOID(a) decltype(void(a))
struct setting{ setting(){cin.tie(nullptr); ios::sync_with_stdio(false);fixed(cout); cout.precision(12);}} setting;
template<int I> struct P : P<I-1>{};
template<> struct P<0>{};
template<class T> void i(T& t){ i(t, P<3>{}); }
void i(vector<bool>::reference t, P<3>){ int a; i(a); t = a; }
template<class T> auto i(T& t, P<2>) -> VOID(cin >> t){ cin >> t; }
template<class T> auto i(T& t, P<1>) -> VOID(begin(t)){ for(auto&& x : t) i(x); }
template<class T, size_t... idx> void ituple(T& t, index_sequence<idx...>){in(get<idx>(t)...);}
template<class T> auto i(T& t, P<0>) -> VOID(tuple_size<T>{}){ituple(t, make_index_sequence<tuple_size<T>::value>{});} 
#undef VOID
}
#define unpack(a) (void)initializer_list<int>{(a, 0)...}
template<class... Ts> void in(Ts&... t){ unpack(IO :: i(t)); }

#undef unpack
constexpr long double PI = 3.141592653589793238462643383279L;
template <class F> struct REC {
    F f;
    REC(F &&f_) : f(forward<F>(f_)) {}
    template <class... Args> auto operator()(Args &&...args) const { return f(*this, forward<Args>(args)...); }};

constexpr int mod = 998244353;
//constexpr int mod = 1000000007;
#line 2 "library/data-structure/FenwickTree.hpp"
template <typename T>
struct FenwickTree{
    int N;
    T total = 0;
    vector<T> data;
    FenwickTree() = default;
    FenwickTree(int size) {init(size);}
    FenwickTree(vector<T> &v) {
        N = v.size() + 2;
        data.reserve(N + 1);
        data.emplace_back(0);
        for(auto &e:v) {
            total += e;
            data.emplace_back(e);
        }
        data.emplace_back(0);
        data.emplace_back(0);
        for (int i = 1; i < N - 1; ++i) {
            int j = i + (i & -i);
            if (j < N - 1) data[j] = data[i] + data[j];
        }
    }
    void init(int size) {
        N = size + 2;
        data.assign(N + 1,{});
    }
    // get sum of [0,k]
    T prod(int k) const {
        if (k < 0) return T{};
        T ret{};
        for (++k;k > 0;k -= k & -k) ret += data[k];
        return ret;
    }
    // get sum of [l,r)
    inline T prod(int l,int r) const {return prod(r - 1) - prod(l - 1);}
    // get value of k
    inline T get(int k) const {return prod(k) - prod(k - 1); }
    T all_prod() const {return total;}
    void add(int k, T x) { 
        total += x;
        for(++k;k < N;k += k & -k) data[k] += x;
    }
    // minimize i s.t. sum(i) >= w
    int lower_bound(T w) {
        if (w <= 0) return 0;
        int x = 0;
        for(int k = 1 <<__lg(N);k;k >>= 1) {
            if (x + k <= N - 1 && data[x + k] < w) {
                w -= data[x + k];
                x += k;
            }
        }
        return x;
    }
    // minimize i s.t. sum(i) > w
    int upper_bound(T w) {
        if (w < 0) return 0;
        int x = 0;
        for(int k = 1 <<__lg(N);k;k >>= 1) {
            if (x + k <= N - 1 && data[x + k] <= w) {
                w -= data[x + k];
                x += k;
            }
        }
        return x;
    }
};
#line 100 "test.cpp"
int main() {
    INT(n,q);
    VEC(ll,a,n);
    vi las(n,-1);
    vi cmd(q),ids(q);
    vl val(q);
    vl V = a;
    rep(i,q) {
        cin >> cmd[i];
        if(cmd[i] == 1) {
            cin >> ids[i] >> val[i];
            ids[i]--;
            V.emplace_back(val[i]);
        }
        else if(cmd[i] == 3) {
            cin >> ids[i];
            ids[i]--;
        }
    }
    sort(all(V));
    V.erase(unique(all(V)),V.end());
    FenwickTree<int> fw(V.size());
    int lassort = -2;
    set<pair<ll,int>> lazy;
    rep(i,n) lazy.insert(make_pair(a[i],i));
    vi del;
    rep(i,q) {
        if(cmd[i] == 1) {
            if(las[ids[i]] > lassort) {
                lazy.erase(make_pair(a[ids[i]],ids[i]));
                lazy.insert(make_pair(val[i],ids[i]));
            }
            else {
                int id = fw.lower_bound(ids[i] + 1);
                del.emplace_back(id);
                lazy.insert(make_pair(val[i],ids[i]));
            }
            a[ids[i]] = val[i];
            las[ids[i]] = i;
        }
        else if(cmd[i] == 2) {
            for(auto &id:del) fw.add(id,-1);
            del.clear();
            for(auto &[x,_]:lazy) {
                int id = lower_bound(all(V),x) - V.begin();
                fw.add(id,1);
            }
            lazy.clear();
            lassort = i;
        }
        else {
            if(las[ids[i]] > lassort) {
                cout << a[ids[i]] << '\n';
            }
            else {
                int id = fw.lower_bound(ids[i]+1);
                cout << V[id] << '\n';
            }
        }
    }
}