#include <cstdio>
#define max(a,b) (a > b) ? a : b
int A[400500], a, b;
inline void update(int nod, int st, int dr){
if(st == dr){
A[nod] = b;
return;
}
int m = (st + dr) / 2;
if(a <= m) {
update(2*nod, st, m);
}
else{
update(2*nod+1, m+1, dr);
}
A[nod] = max(A[2 * nod], A[2 * nod + 1]);
}
inline int query(int nod, int st, int dr){
if(a <= st && b >= dr)
return A[nod];
int m = (st + dr) / 2;
int max1 = -1, max2 = -1;
if(a <= m) max1 = query(2*nod, st, m);
if(b > m) max2 = query(2*nod + 1, m+1, dr);
return max(max1, max2);
}
int main(){
int n = 0, m = 0;
FILE *fin, *fout;
fin = fopen("arbint.in", "r");
fout = fopen("arbint.out", "w");
fscanf(fin, "%d %d", &n, &m);
for(int i = 1; i <= n; i++){
fscanf(fin, "%d", &b);
a = i; update(1, 1, n);
}
int op;
for(register int i = 0; i < m; i++){
fscanf(fin, "%d %d %d", &op, &a, &b);
if(op == 1) update(1, 1, n);
else fprintf(fout, "%d\n", query(1, 1, n) );
}
return 0;
}