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  • 2112HDU Today(Dijkstra)

    #include <iostream>
    #include <algorithm>
    #include <cstring>
    #include <vector>
    #include <string>
    #include <map>
    #include <queue>
    using namespace std;
    #ifndef ONLINE_JUDGE
    #include <fstream>
    ifstream fin("test.txt");
    #define cin fin
    #endif
    const int INF = 1000000;
    int graph[200][200];
    map <string, int> m;
    int d[200],vis[200];
    int main()
    {
        ios::sync_with_stdio(false);
        int i,t,num,j;
        string a,b;
        int n;
        while(cin >> n)
        {
            if(n == -1)
            break;
            m.clear();
            memset(graph,INF,sizeof(graph));
            cin >> a >> b;
            int ok = 1;
            if(a == b)
            {
                ok = 0;
            }
            m[a] = 1;     
            m[b] = 2;
            num = 3;
            for(i = 0; i < n; ++i)
            {
                cin >> a >> b >> t;
                if(!m[a])
                m[a] = num++;
                if(!m[b])
                m[b] = num++;
                if(t < graph[m[a]][m[b]])
                graph[m[a]][m[b]] = graph[m[b]][m[a]] = t;
            }
            memset(vis,0,sizeof(vis));
            for(i = 1; i <= num; ++i)
            d[i] = (i == 1) ? 0 : INF;
            for(i = 1; i <= num; ++i)
            {
                int MIN = INF,x = 1;
                for(int y = 1; y <= num; ++y)
                if(!vis[y] && d[y] < MIN)
                MIN = d[x=y];
                vis[x] = 1;
                for(int y = 1; y <= num; ++y)
                d[y] = min(d[y],d[x]+graph[x][y]);
            }
            if(ok == 0)
            {
                cout << 0 << endl;
                continue;
            }
            if(d[2]!=INF)
            cout << d[2] << endl;
            else
            cout << -1 << endl;
        }
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/fchx/p/3097587.html
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