刘备要准备一场对黄巾军的战斗, 为此他必须选择一批勇士参与这场战斗。战斗部队需要有l
到u 名勇士。每一个勇士都是某个宗族的成员，而且有的宗族之间的人相互敌视。在战斗部队中，
不能有多于m 对勇士的宗族是互相敌视的。战斗部队的战斗力是由部队中全体勇士的战斗力之和
决定的，而问题的目标是要使战斗部队的战斗力最大化(Liu Bei was ready for a battle of the Yellow turban army, so he must choose a group of warriors in the battle. Combat troops need to have l
To the U warrior. Every warrior is a member of a clan, and some of the clans are hostile to each other. In the fighting forces,
No more than M's clans of the warriors are hostile to each other. The fighting force of the fighting forces is the fighting power of all the warriors in the army.
It is decided that the goal of the problem is to maximize the combat effectiveness of the fighting forces.)