Comments
+6

nice :)
+6

163E - Электронное правительство

is also a aho problem
+1

...

thank's :D
+1

how did u solve it with Dsu on tree?

can u explain your approach ? :)
0

hi i cant find the bug in my code

can anyone help ? http://codeforces.me/contest/893/submission/32598508
0

yes

+3

bro in youre pow function

you should set it to :

long long pow(long long x, long long y, long long mod) { ... }

you've overflowed ;-)
+3

read my next comment
+5

I like the way of setting pretests and main tests ;-)

good job