第12周项目2-操作用邻接表存储的图
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问题:
头文件及功能函数详见【图算法库】
利用下图作为测试用图,输出结果。
(1)输出出图G中每个顶点的出度
代码:
- #include "graph.h"
-
-
- int OutDegree(ALGraph *G,int v)
- {
- ArcNode *p;
- int n=0;
- p=G->adjlist[v].firstarc;
- while (p!=NULL)
- {
- n++;
- p=p->nextarc;
- }
- return n;
- }
-
- void OutDs(ALGraph *G)
- {
- int i;
- for (i=0; i<G->n; i++)
- printf(" 顶点%d:%d\n",i,OutDegree(G,i));
- }
- int main()
- {
- ALGraph *G;
- int A[7][7]=
- {
- {0,1,1,1,0,0,0},
- {0,0,0,0,1,0,0},
- {0,0,0,0,1,1,0},
- {0,0,0,0,0,0,1},
- {0,0,0,0,0,0,0},
- {0,0,0,1,1,0,1},
- {0,1,0,0,0,0,0}
- };
- ArrayToList(A[0], 7, G);
- printf("各顶点出度:\n");
- OutDs(G);
- return 0;
- }
运行结果:
(2)求出图G中出度最大的一个顶点,输出该顶点编号
代码:
- #include "graph.h"
-
-
- int OutDegree(ALGraph *G,int v)
- {
- ArcNode *p;
- int n=0;
- p=G->adjlist[v].firstarc;
- while (p!=NULL)
- {
- n++;
- p=p->nextarc;
- }
- return n;
- }
-
-
- void OutDs(ALGraph *G)
- {
- int i;
- for (i=0; i<G->n; i++)
- printf(" 顶点%d:%d\n",i,OutDegree(G,i));
- }
-
-
- void OutMaxDs(ALGraph *G)
- {
- int maxv=0,maxds=0,i,x;
- for (i=0; i<G->n; i++)
- {
- x=OutDegree(G,i);
- if (x>maxds)
- {
- maxds=x;
- maxv=i;
- }
- }
- printf("顶点%d,出度=%d\n",maxv,maxds);
- }
-
- int main()
- {
- ALGraph *G;
- int A[7][7]=
- {
- {0,1,1,1,0,0,0},
- {0,0,0,0,1,0,0},
- {0,0,0,0,1,1,0},
- {0,0,0,0,0,0,1},
- {0,0,0,0,0,0,0},
- {0,0,0,1,1,0,1},
- {0,1,0,0,0,0,0}
- };
- ArrayToList(A[0], 7, G);
-
- printf("最大出度的顶点信息:");
- OutMaxDs(G);
-
- return 0;
- }
运行结果:
(3)计算图G中出度为0的顶点数;
代码:
- #include "graph.h"
-
-
- int OutDegree(ALGraph *G,int v)
- {
- ArcNode *p;
- int n=0;
- p=G->adjlist[v].firstarc;
- while (p!=NULL)
- {
- n++;
- p=p->nextarc;
- }
- return n;
- }
-
-
- void OutDs(ALGraph *G)
- {
- int i;
- for (i=0; i<G->n; i++)
- printf(" 顶点%d:%d\n",i,OutDegree(G,i));
- }
-
-
- void ZeroDs(ALGraph *G)
- {
- int i,x;
- for (i=0; i<G->n; i++)
- {
- x=OutDegree(G,i);
- if (x==0)
- printf("%2d",i);
- }
- printf("\n");
- }
-
- int main()
- {
- ALGraph *G;
- int A[7][7]=
- {
- {0,1,1,1,0,0,0},
- {0,0,0,0,1,0,0},
- {0,0,0,0,1,1,0},
- {0,0,0,0,0,0,1},
- {0,0,0,0,0,0,0},
- {0,0,0,1,1,0,1},
- {0,1,0,0,0,0,0}
- };
- ArrayToList(A[0], 7, G);
-
- printf("出度为0的顶点:");
- ZeroDs(G);
-
- return 0;
- }
运行结果:
(4)判断图G中是否存在边<i,j>
- #include "graph.h"
-
-
- int OutDegree(ALGraph *G,int v)
- {
- ArcNode *p;
- int n=0;
- p=G->adjlist[v].firstarc;
- while (p!=NULL)
- {
- n++;
- p=p->nextarc;
- }
- return n;
- }
-
-
- void OutDs(ALGraph *G)
- {
- int i;
- for (i=0; i<G->n; i++)
- printf(" 顶点%d:%d\n",i,OutDegree(G,i));
- }
-
-
- void OutMaxDs(ALGraph *G)
- {
- int maxv=0,maxds=0,i,x;
- for (i=0; i<G->n; i++)
- {
- x=OutDegree(G,i);
- if (x>maxds)
- {
- maxds=x;
- maxv=i;
- }
- }
- printf("顶点%d,出度=%d\n",maxv,maxds);
- }
-
- void ZeroDs(ALGraph *G)
- {
- int i,x;
- for (i=0; i<G->n; i++)
- {
- x=OutDegree(G,i);
- if (x==0)
- printf("%2d",i);
- }
- printf("\n");
- }
-
-
- bool Arc(ALGraph *G, int i,int j)
- {
- ArcNode *p;
- bool found = false;
- p=G->adjlist[i].firstarc;
- while (p!=NULL)
- {
- if(p->adjvex==j)
- {
- found = true;
- break;
- }
- p=p->nextarc;
- }
- return found;
- }
-
- int main()
- {
- ALGraph *G;
- int A[7][7]=
- {
- {0,1,1,1,0,0,0},
- {0,0,0,0,1,0,0},
- {0,0,0,0,1,1,0},
- {0,0,0,0,0,0,1},
- {0,0,0,0,0,0,0},
- {0,0,0,1,1,0,1},
- {0,1,0,0,0,0,0}
- };
- ArrayToList(A[0], 7, G);
-
- printf("边<2,6>存在吗?");
- if(Arc(G,2,6))
- printf("是\n");
- else
- printf("否\n");
- printf("\n");
-
- return 0;
- }
运行结果:
知识点总结:
图算法库的应用。
学习心得:
过程很多,实现不容易,但实现第一个后后面的就有规律可循了。
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