看到书上一段程序，但是不太明白他那句“输入边(vi,vj)上的下标i，下标j和权值:\n”是要输入什么。。。能不能请各位大神看看，给我个输入样例...
程序如下：
#include <cstdio>
#include <cstring>
#include <cstdlib>
typedef char VertexType;               
typedef int EdgeType;                 

#define MAXVEX  100            
#define INF   0               

typedef struct
{
    VertexType vexs[MAXVEX];            
    EdgeType   arc[MAXVEX][MAXVEX];         
    int numVertexes, numEdges;      
}Graph;

//定位
int locates(Graph *g, char ch)
{
    int i = 0;
    for (i = 0; i < g->numVertexes; i++)
    {
        if (g->vexs[i] == ch)
        {
            return i;
        }
    }
    if (i >= g->numVertexes)
    {
        return -1;
    }
}

//建立一个无向网图的邻接矩阵表示
void CreateGraph(Graph *g)
{
    int i, j, k, w;
    printf("输入顶点数和边数:\n");
    scanf("%d %d", &(g->numVertexes), &(g->numEdges));
    printf("%d %d\n", g->numVertexes, g->numEdges);
    printf("输入顶点：\n");
    for (i = 0; i < g->numVertexes; i++)
    {
        g->vexs[i] = getchar();
        while (g->vexs[i] == '\n')
        {
            g->vexs[i] = getchar();
        }
    }
    for (i = 0; i < g->numVertexes; i++)
    {
        printf("%c ", g->vexs[i]);
    }
    printf("\n");
    for (i = 0; i < g->numVertexes; i++)
    {
        for (j = 0; j < g->numVertexes; j++)
        {
            g->arc[i][j] = INF; //邻接矩阵初始化
        }
    }
    for (k = 0; k < g->numEdges; k++)
    {
        char p, q;
        printf("输入边(vi,vj)上的下标i，下标j和权值:\n");
        p = getchar();
        while (p == '\n')
        {
            p = getchar();
        }
        q = getchar();
        while (q == '\n')
        {
            q = getchar();
        }
        scanf("%d", &w);
        int m = -1;
        int n = -1;
        m = locates(g, p);
        n = locates(g, q);
        if (n == -1 || m == -1)
        {
            fprintf(stderr, "there is no this vertex.\n");
            return;
        }
        //getchar();
        g->arc[m][n] = w;
        g->arc[n][m] = g->arc[m][n];  
    }
}

void printGraph(Graph g)
{
    int i, j;
    for (i = 0; i < g.numVertexes; i++)
    {
        for (j = 0; j < g.numVertexes; j++)
        {
            printf("%6d ", g.arc[i][j]);
        }
        printf("\n");
    }
}
int main()
{
    Graph g;
    CreateGraph(&g);
    printGraph(g);
    return 0;
}

输入两个代表顶点的字母，而不是什么下标上标。
然后输入边上的权值（整数）。