program abint;
var A : array [1..100000] of longint;
    n,m,i,x,y,max,j : longint;
    p : shortint;
    f,g : text;
begin
assign(f,'arbint.in');
reset(f);
assign(g,'arbint.out');
rewrite(g);

readln(f,n,m);

for i := 1 to n do
read(f,A[i]);

readln(f);

for i := 1 to m do begin

readln(f,p,x,y);

if p=0 then begin
            max := 0;

            for j := x to y do
            if A[j]>max then max := A[j];

            writeln(g,max);
            end
            else A[x] := y;

end;

close(f);
close(g);

end.