here it is

How to solve it with Disjoint Data Structure .

thanks .

UPDATE : any help , i can't get the idea.

HI All , problem from a contest hosted by my university .

here it is (http://a2oj.com/p.jsp?ID=282) .

any idea how to solve it .

thanks .

Codeforces Round #262 (Div. 2) :

all these new accounts just registered in codeforces before 29 hour ago except "Memset137" :

6wr1

shaojj

poaspoas1

girlfriends9

Nyaruko

kiss_me

KingTon

Memset137

QLSpirit_001

prathyu

maybe i am wrong but it is obvious that they are Div1 participants depending on what they solve !! now if we eliminate these participants we will get the TRUE standing .

1 — buptcjj

2 — ladpro98

3 — linjek

4 — RetiredAmrMahmoud

5 — rureggaeton

6 — win_ay39

7 — kalimm

why they do this ?!! they can participate even if they are Div1 !