模块依赖关系问题（一个系统的若干模块之间存在互相依赖的关系，如果A模块调用了B模块的接口）

一个系统的若干模块之间存在互相依赖的关系，如果A模块调用了B模块的接口，那么成为A依赖B，记为A->B
如果A->B，B->A，那么称A和B模块都存在循环依赖。
如果A->B，B->C，C->D，D->B，那么BCD存在循环依赖，A不存在循环依赖，以此类推
先输入若干模块之间的关系，判断某模块是否存在循环依赖。模块ID范围为0--0xffffffff

调用者保证相同的关系不重复输入

输入：

模块间关系，注意最后一行没有“，”结尾

输出描述：
模块是否循环依赖，注意最后一行没有“，”结尾

样例：

输入：

{0x00, 0x01},
{0x02, 0x03},
{0x03, 0x04}

输出：
{0x00, false},
{0x01, false},
{0x02, false},
{0x03, false},

{0x04, false}

代码（没有优化，只实现功能）

#include 
#include 
#include 
#include 

我的一些测试用例：

// 有断点，无循环
{0x00, 0x01},
{0x02, 0x03},
{0x03, 0x04}


{0x00, false},
{0x01, false},
{0x02, false},
{0x03, false},
{0x04, false}


// 有断点、有循环
{0x00, 0x01},
{0x01, 0x03},
{0x02, 0x04},
{0x03, 0x00}


{0x00, true},
{0x01, true},
{0x02, false},
{0x03, true},
{0x04, false}


// 无断点、无循环
{0x00, 0x02},
{0x02, 0x03},
{0x03, 0x04}


{0x00, false},
{0x02, false},
{0x03, false},
{0x04, false}


// 有断点、两个循环
{0x01, 0x02},
{0x03, 0x01},
{0x02, 0x03},
{0x04, 0x09},
{0x07, 0x05},
{0x05, 0x06},
{0x06, 0x07}


{0x01, true},
{0x02, true},
{0x03, true},
{0x04, false},
{0x05, true},
{0x06, true},
{0x07, true},
{0x09, false}


// 两个循环、其中一个有个把
{0x01, 0x02},
{0x03, 0x01},
{0x02, 0x03},
{0x04, 0x05},
{0x07, 0x05},
{0x05, 0x06},
{0x06, 0x07}


{0x01, true},
{0x02, true},
{0x03, true},
{0x04, false},
{0x05, true},
{0x06, true},
{0x07, true}


// 有循环、节点后面有分叉
{0x05, 0x01},
{0x01, 0x02},
{0x02, 0x04},
{0x02, 0x03},
{0x03, 0x01}


{0x01, true},
{0x02, true},
{0x03, true},
{0x04, false},
{0x05, false}


// 无循环、节点后有分叉
{0x01, 0x02},
{0x02, 0x04},
{0x02, 0x03}


{0x01, false},
{0x02, false},
{0x03, false},
{0x04, false}


// 有循环、节点后有分叉
{0x01, 0x02},
{0x02, 0x04},
{0x04, 0x01},
{0x02, 0x03},
{0x03, 0x05}


{0x01, true},
{0x02, true},
{0x03, false},
{0x04, true},
{0x05, false}


// 几点后有分叉、无循环
{0x01, 0x03},
{0x02, 0x05},
{0x01, 0x06},
{0x02, 0x07}


{0x01, false},
{0x02, false},
{0x03, false},
{0x05, false},
{0x06, false},
{0x07, false}


// 有循环，节点后有很多分叉
{0x05, 0x01},
{0x01, 0x02},
{0x02, 0x03},
{0x03, 0x06},
{0x02, 0x04},
{0x04, 0x01},
{0x04, 0x07}


{0x01, true},
{0x02, true},
{0x03, false},
{0x04, true},
{0x05, false},
{0x06, false},
{0x07, false}


// 循环带个把
{0x05, 0x01},
{0x01, 0x02},
{0x02, 0x03},
{0x03, 0x01}


{0x01, true},
{0x02, true},
{0x03, true},
{0x05, false}


// 大循环包裹小循环
{0x01, 0x02},
{0x02, 0x03},
{0x03, 0x01},
{0x01, 0x04},
{0x04, 0x05},
{0x05, 0x01}


{0x01, true},
{0x02, true},
{0x03, true},
{0x04, true},
{0x05, true}


// 有循环、节点后有分叉
{0x01, 0x02},
{0x02, 0x03},
{0x02, 0x04},
{0x03, 0x01},
{0x05, 0x01}


{0x01, true},
{0x02, true},
{0x03, true},
{0x04, false},
{0x05, false}


// 交叉循环
{0x05, 0x01},
{0x01, 0x02},
{0x02, 0x03},
{0x03, 0x04},
{0x04, 0x01},
{0x03, 0x07},
{0x07, 0x06},
{0x06, 0x04}




{0x01, true},
{0x02, true},
{0x03, true},
{0x04, true},
{0x05, false},
{0x06, true},
{0x07, true}


// 交叉循环
{0x05, 0x01},
{0x01, 0x02},
{0x02, 0x03},
{0x03, 0x04},
{0x04, 0x01},
{0x07, 0x03},
{0x06, 0x07},
{0x04, 0x06}


{0x01, true},
{0x02, true},
{0x03, true},
{0x04, true},
{0x05, false},
{0x06, true},
{0x07, true}


// 两个循环相连
{0x05, 0x01},
{0x01, 0x02},
{0x02, 0x03},
{0x03, 0x04},
{0x04, 0x01},
{0x04, 0x06},
{0x06, 0x07},
{0x08, 0x06},
{0x07, 0x08}


{0x01, true},
{0x02, true},
{0x03, true},
{0x04, true},
{0x05, false},
{0x06, true},
{0x07, true},
{0x08, true}


// 两个无关的环，有把
{0x01, 0x02},
{0x02, 0x03},
{0x03, 0x02},
{0x03, 0x04},
{0x04, 0x02},
{0x07, 0x08},
{0x08, 0x09},
{0x07, 0x09},
{0x09, 0x07}


// 两个相连的环，有把
{0x01, 0x02},
{0x02, 0x03},
{0x03, 0x02},
{0x03, 0x04},
{0x04, 0x02},
{0x07, 0x08},
{0x08, 0x09},
{0x07, 0x09},
{0x09, 0x07},
{0x03, 0x07}


{0x01, false},
{0x02, true},
{0x03, true},
{0x04, true},
{0x07, true},
{0x08, true},
{0x09, true}