alpha beta剪枝

要求的输出格式如下：（“//”和之后的内容表示说明，实际并不输出）

//第一行表示根节点的状态

A 1 B2 　　//A表示根节点，1表示A的倒推值，B2表示剪枝搜索后下一步应该走的路线

//之后每一行都表示一个剪枝，节点的顺序随意

D2：E4 //表示在D2节点发生了剪枝，E4节点被剪掉了。这里只需给出

//被剪枝节点的被剪掉的直接子节点即可。

C2：D4 D5 D6 //表示在C2处发生了剪枝，D4 D5 D6三个子节点被剪掉了。

//其他节点类似给出

-alpha beta pruning required output format is as follows :(" //"　and after the contents of that note, does not really make out)// The first line, said the state of root node A 1 B2// A that root, one that A, push down the value, B2 indicated that pruning should take the next step after a search of the route// Each line represents a pruning later the node order of random D2: E4// that occurred in the D2 node pruning, E4 node is cut off a. Suffice it gives// by pruning nodes have been cut can be a direct child nodes. C2: D4 D5 D6// that occurred at the C2 at pruning, D4 D5 D6 3 child nodes have been cut off.// Other nodes are given similar