暑假第一天

今天下午下学期,我完成了普利姆算法的编写,以下是我的源代码

#include <iostream>
#define MVNum 10
#define MaxInt 32767
using namespace std;

struct edge {
char adjvex;
int lowcost;
}closedge[MVNum];

typedef struct {
char vexs[MVNum];
int arcs[MVNum][MVNum];
int vexnum, arcnum;
}AMGraph;
int LocateVex(AMGraph G, char v);//实现细节隐藏
int Min(AMGraph G);//实现细节隐藏
int CreateUDN(AMGraph& G);//实现细节隐藏

void Prim(AMGraph G, char u);

int main() {
AMGraph G;
CreateUDN(G);
char u;
cin >> u;
Prim(G, u);
return 0;
}
void Prim(AMGraph G, char v)
{
int distance[G.vexnum];
int parent[G.vexnum];
//记录v的下标
int index = 0;
int i, min = MaxInt, imin, count = 0;
// 1.初始化这棵树，即以v为起始点，同时初始化数组distance[]
// 注：distance数组表示该树的任意一点到该点的最小距离

//寻找v的下标
for (i = 0; i < G.vexnum; i++)
{
if (G.vexs[i] == v)
{
index = i;
}

}
for (i = 0; i < G.vexnum; i++)
{
if (i == index)
{
distance[i] = 0;
parent[i] = index;
}
else
{
distance[i] = G.arcs[index][i];
parent[i] = index;
}
}
while (1)
{
if (count == G.vexnum - 1)
{
break;
}

// 2.从小树现有的结点出发，寻找边权值最小的点：
for (i = 0; i < G.vexnum; i++) {
if (min > distance[i] && distance[i] != 0)
{
//记录最小值及其下标
min = distance[i];
imin = i;

}

}
//更新已到达过得节点数

count++;
// 3.找到后输出该边
if (count < G.vexnum - 1)
{
printf("%c->%c\n", G.vexs[parent[imin]], G.vexs[imin]);
}
else
{
printf("%c->%c", G.vexs[parent[imin]], G.vexs[imin]);
}

 

//初始化min以便下次寻找
min = MaxInt;
// 4.将该点的distance数组中的值赋值为0，标记已经遍历过
distance[imin] = 0;
// 5.循环遍历结点，更新distance[]数组
for (i = 0; i < G.vexnum; i++) {
if (distance[i] != 0 && G.arcs[i][imin] < MaxInt)
{
if (distance[i] > G.arcs[i][imin])
{
distance[i] = G.arcs[i][imin];
parent[i] = imin;
}
}
}
}
}