#include<algorithm>
#include<bitset>
#include<cmath>
#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<ctime>
#include<deque>
#include<fstream>
#include<iomanip>
#include<iostream>
#include<map>
#include<queue>
#include<set>
#include<stack>
#include<unordered_map>
#include<unordered_set>
#include<utility>
#include<vector>

using namespace std;

#define dbg(x) (cout<<#x<<" = "<<(x)<<'\n')
#ifdef HOME
const string inputFile = "input.txt";
const string outputFile = "output.txt";
#else
const string problemName = "arbint";
const string inputFile = problemName + ".in";
const string outputFile = problemName + ".out";
#endif // HOME

typedef long long int lld;
typedef pair<int, int> PII;
typedef pair<int, lld> PIL;
typedef pair<lld, int> PLI;
typedef pair<lld, lld> PLL;

const int INF = (1LL << 31) - 1;
const lld LINF = (1LL << 62) - 1;
const int dx[] = {1, 0, -1, 0, 1, -1, 1, -1};
const int dy[] = {0, 1, 0, -1, 1, -1, -1, 1};
const int MOD = (int)(1e9) + 7;

const int NMAX = 100000 + 5;
const int MMAX = 100000 + 5;
const int KMAX = 100000 + 5;
const int PMAX = 100000 + 5;
const int LMAX = 100000 + 5;
const int VMAX = 100000 + 5;

int N, M;
int V[NMAX];
int AI[4 * NMAX];

void build(int nod, int lo, int hi) {
    if(lo == hi) {
        AI[nod] = V[lo];
        return;
    }

    int mi = (lo + hi) / 2;

    build(2 * nod, lo, mi);
    build(2 * nod + 1, mi + 1, hi);

    AI[nod] = max(AI[2 * nod], AI[2 * nod + 1]);
}

void update(int nod, int lo, int hi, int poz, int val) {
    if(lo == hi) {
        AI[nod] = val;
        V[poz] = val;
        return;
    }

    int mi = (lo + hi) / 2;

    if(poz <= mi)
        update(2 * nod, lo, mi, poz, val);
    else
        update(2 * nod + 1, mi + 1, hi, poz, val);

    AI[nod] = max(AI[2 * nod], AI[2 * nod + 1]);
}

int query(int nod, int lo, int hi, int L, int R) {
    if(L <= lo && hi <= R)
        return AI[nod];

    if(hi < L || R < lo)
        return -1;

    int mi = (lo + hi) / 2;

    int q1 = query(2 * nod, lo, mi, L, R);
    int q2 = query(2 * nod + 1, mi + 1, hi, L, R);

    return max(q1, q2);
}

int main() {
    int i, t, x, y;

#ifndef ONLINE_JUDGE
    freopen(inputFile.c_str(), "r", stdin);
    freopen(outputFile.c_str(), "w", stdout);
#endif

    scanf("%d%d", &N, &M);

    for(i = 1; i <= N; i++)
        scanf("%d", &V[i]);

    build(1, 1, N);

    while(M--) {
        scanf("%d%d%d", &t, &x, &y);
        if(!t)
            printf("%d\n", query(1, 1, N, x, y));
        else
            update(1, 1, N, x, y);
    }

    return 0;
}