create InterestingPaty TestCase

Signed-off-by: Atsushi Iwasa <a-iwasa@biglobe.co.jp>
add InterestingParty Solver

Signed-off-by: Atsushi Iwasa <a-iwasa@biglobe.co.jp>
無駄な部分を削除

Signed-off-by: Atsushi Iwasa <a-iwasa@biglobe.co.jp>