【floyd/要防重边】HDU 2923 Einbahnstrasse

http://acm.hdu.edu.cn/showproblem.php?pid=2923

一开始题意理解错了……英语太水了
要从公司开始按所给顺序把车拉回来，是一辆一辆车拖回来……这是常识……我竟然想着最后一堆车拖回来


Sample Input
4 2 5
NewTroy Midvale Metrodale
NewTroy   <-20-> Midvale
Midvale   --50-> Bakerline
NewTroy    <-5-- Bakerline
Metrodale <-30-> NewTroy
Metrodale  --5-> Bakerline
0 0 0

Sample Output
1. 80

#include <iostream>
#include <fstream>
#include <algorithm>
#include <string>
#include <set>
#include <map>
#include <queue>
#include <utility>
#include <stack>
#include <list>
#include <vector>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
//#include <ctime>
#include <ctype.h>
using namespace std;
#define inf 0x3fffffff
#define M 1005

map<string, int> m;
int n, dist[M][M], ind[M];

void init ()
{
    m.clear();
    int i, j;
    for (i = 1; i <= n; i++)
        for (j = i + 1; j <= n; j++)
            dist[i][j] = dist[j][i] = inf;
}

void floyd ()
{
    int i, j, k;
    for (k = 1; k <= n; k++)
        for (i = 1; i <= n; i++)
            for (j = 1; j <= n; j++)
                if (dist[i][k] + dist[k][j] < dist[i][j])
                    dist[i][j] = dist[i][k] + dist[k][j];
}

int main()
{
    int c, r, i, key, w, res, cc = 1, len, k, j, u, v;
    bool flag, mark;
    char s1[15], s2[15], s[15], tp[15];
    while (scanf ("%d%d%d", &n, &c, &r), (n||c||r))
    {
        key = 1;
        init ();
        for (i = 0; i <= c; i++)
        {
            scanf ("%s", s);
            string p(s);
            if (m[p] == 0)
                m[p] = key++;    //将字符串p映射为key【编号】
            ind[i] = m[p];
        }
        for (i = 0; i < r; i++)
        {
            flag = mark = false;
            scanf ("%s%s%s", s1, s, s2);
            string p1(s1);
            if (m[p1] == 0)
                m[p1] = key++;
            u = m[p1];
            string p2(s2);
            if (m[p2] == 0)
                m[p2] = key++;
            v = m[p2];
            len = strlen(s);
            k = 0;
            for (j = 0; j < len; j++)
            {
                if (s[j] == '<') flag = true;
                if (s[j] == '>') mark = true;
                if (s[j] >= '0' && s[j] <= '9')
                    tp[k++] = s[j];    //tp读取箭头中间的数字
            }
            tp[k] = 0;
            sscanf (tp, "%d", &w);    //tp转化成int存放到w
            if (flag && w < dist[v][u]) dist[v][u] = w;
            if (mark && w < dist[u][v]) dist[u][v] = w;
			//记得判断重边【w < dist[v][u]】，wa了无数次
        }
        floyd();
        res = 0;
        for (i = 1; i <= c; i++)
            res += (dist[1][ind[i]] + dist[ind[i]][1]);
		//先从1去那里，再把车拉回1，根据题意，是按顺序一个一个拖回来
        printf ("%d. %d\n", cc++, res);
    }
    return 0;
}