说明：ICM 2011_Problem C(How environmentally and economically sound
说明：ICM 2011_Problem C(How environmentally and economically sound
说明：ICM 2011_Problem C(How environmentally and economically sound
说明：ICM 2012_Problem A(The Leaves of a Tree)
说明：ICM 2012_Problem A(The Leaves of a Tree)
说明：ICM 2012_Problem A(The Leaves of a Tree)
说明：ICM 2012_Problem A(The Leaves of a Tree)
说明：ICM 2012_Problem B(Camping along the Big Long River)
说明：ICM 2012_Problem B(Camping along the Big Long River)
说明：ICM 2012_Problem B(Camping along the Big Long River)