#include <fstream>
using namespace std;
ifstream fin("arbint.in");
ofstream fout("arbint.out");
int N,M, MaxArb[400020], start, finish, val, pos, maxim;
inline int Maxim(int a, int b) {
if ( a > b ) return a;
return b;
}
void Update(int nod, int left, int right){
if(left == right){
MaxArb[nod] = val;
return;
}
int div = (left+right)/2;
if(pos <= div) Update(2*nod, left, div);
else Update(2*nod+1, div+1, right);
MaxArb[nod] = Maxim(MaxArb[2*nod], MaxArb[2*nod+1]);
}
void Query(int nod, int left, int right){
if(start <= left && right <= finish){
if(maxim < MaxArb[nod]) maxim = MaxArb[nod];
return;
}
int div = (left + right)/2;
if(start <= div) Query(2*nod, left, div);
if(div < finish) Query(2*nod+1, div+1, right);
}
int main(){
bool op;
int A, B;
fin>>N>>M;
for(int i = 1; i<=N; i++){
fin>>A;
pos = i, val = A;
Update(1,1,N);
}
for(int i = 1; i<=M; i++){
fin>>op >> A >> B;
if(!op){
maxim = -1;
start = A, finish = B;
Query(1,1,N);
fout<<maxim<<"\n";
}
else{
pos = A, val = B;
Update(1,1,N);
}
}
return 0;
}