#include <cstdio>

#define NMAX 100004

using namespace std;


int N, M, v[NMAX], T[4*NMAX];
int val, pos, S, E;

void build(int node, int st, int dr) {
    if(st == dr) {
        T[node] = v[st];
    } else {
        int mid = (st + dr) / 2;
        build(2 * node, st, mid);
        build(2 * node + 1, mid + 1, dr);
        T[node] = max(T[2 * node], T[2 * node + 1]);
    }
}

void update(int node, int st, int dr) {
    if(st == dr) {
        T[node] = val;
    } else {
        int mid = (st + dr) / 2;
        if(pos <= mid) {
            update(2 * node, st, mid);
        } else {
            update(2 * node + 1, mid + 1, dr);
        }
        T[node] = max(T[2 * node], T[2 * node + 1]);
    }

}

void query(int node, int st, int dr) {
    if(S <= st && dr <= E) {
        val = max(val, T[node]);
    } else {
        int mid = (st + dr) / 2;
        if(S <= mid) {
            query(2*node, st, mid);
        }
        if(E > mid) {
            query(2*node + 1, mid + 1, dr);
        }
    }
}

int main() {
    freopen("arbint.in", "r", stdin);
    freopen("arbint.out", "w", stdout);

    scanf("%d %d", &N, &M);
    for(int i = 1; i <= N; i++) {
        scanf("%d", &v[i]);
    }

    build(1, 1, N);

    for(int i = 1; i <= M; i++) {
        int cerinta;
        scanf("%d", &cerinta);
        if(cerinta) {
            scanf("%d %d", &pos, &val);
            update(1, 1, N);
        } else {
            scanf("%d %d", &S, &E);
            val = 0;
            query(1, 1, N);
            printf("%d\n", val);
        }
    }

}