<s>
In	O
data	B-General_Concept
structures	I-General_Concept
,	O
the	O
range	B-Data_Structure
mode	I-Data_Structure
query	I-Data_Structure
problem	O
asks	O
to	O
build	O
a	O
data	B-General_Concept
structure	I-General_Concept
on	O
some	O
input	O
data	O
to	O
efficiently	O
answer	O
queries	O
asking	O
for	O
the	O
mode	O
of	O
any	O
consecutive	O
subset	O
of	O
the	O
input	O
.	O
</s>
<s>
Let	O
and	O
be	O
any	O
multisets	B-Language
.	O
</s>
<s>
Any	O
data	B-General_Concept
structure	I-General_Concept
using	O
cells	O
of	O
bits	O
each	O
needs	O
time	O
to	O
answer	O
a	O
range	B-Data_Structure
mode	I-Data_Structure
query	I-Data_Structure
.	O
</s>
<s>
The	O
total	O
space	O
used	O
by	O
this	O
data	B-General_Concept
structure	I-General_Concept
is	O
,	O
which	O
reduces	O
to	O
if	O
we	O
take	O
.	O
</s>
