<s>
Yo-Yo	B-Operating_System
is	O
a	O
distributed	O
algorithm	O
aimed	O
at	O
minimum	O
finding	O
and	O
leader	B-Operating_System
election	I-Operating_System
in	O
generic	O
connected	O
undirected	O
graph	O
.	O
</s>
<s>
Unlike	O
Mega-Merger	B-Operating_System
it	O
has	O
a	O
trivial	O
termination	O
and	O
cost	O
analysis	O
.	O
</s>
<s>
Yo-yo	B-Operating_System
was	O
introduced	O
by	O
Nicola	O
Santoro	O
.	O
</s>
<s>
Yo-Yo	B-Operating_System
builds	O
elects	O
a	O
minimum	B-Operating_System
leader	I-Operating_System
under	O
the	O
following	O
premises	O
:	O
</s>
<s>
The	O
Yo-Yo	B-Operating_System
phases	O
consist	O
of	O
a	O
forward	O
and	O
backward	O
scan	O
of	O
the	O
structure	O
,	O
hence	O
messages	O
,	O
where	O
is	O
the	O
number	O
of	O
current	O
active	O
edges	O
.	O
</s>
