#include <stdio.h>

#define NX (1<<17)
#define INF (0x3f3f3f3f)

int T[ NX ], a[ NX ];
int N, M;

int que( int l, int r )
{
	int p, q, m = 0;

	for( p=r-(r&-r); l<=r; r=p, p-=p&-p )
	{
		q = ( p+1 >= l ) ? T[r] : (p=r-1) + 1;
		if( a[m] < a[q] )
			m = q;
	}

	return m;
}

void upd( int x )
{
	int y, z;
	for( y = x; x <= N; x += x & -x )
		if( T[x] == y ) {
			z = que( x-(x&-x) + 1, x-1 );
			T[x] = (a[z] > a[x]) ? z : x;
		}
		else
			if( a[ T[x] ] < a[ y ] )
				T[x] = y;
}

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

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

	a[0] = -INF;
	scanf( "%d%d", &N, &M );

	for( i = 1; i <= N; i++ )
	{
		scanf( "%d", a+i );
		upd( i );
	}

	while( M-- )
	{
		scanf( "%d%d%d", &op, &x, &y );
		if( op == 0 )
			printf( "%d\n", a[ que( x, y ) ] );
		else
			a[x] = y, upd( x );
	}

	return 0;
}