PAT甲级 1030 Travel Plan

算法是dijkstra，可以不用DFS，在计算的时候同步更新边的cost和weight，然后将最短路存在vector里面就可以了，相对比较简单

#include 
#include 
#include 
using namespace std;

#define INF 0x3f3f3f3f
int loadw[505][505];
int loadc[505][505];
int loadsumw[505];
int loadsumc[505];
bool vis[505] = {false};
int n,m,s,d;
vector<int>path[505];

void dijkstra(int root)
{
    loadsumw[root] = 0;
    loadsumc[root] = 0;
    for(int i = 0;i<n;i++)
    {
        int temp = -1;
        int minn = INF;
        for(int j = 0 ;j<n;j++)
        {
            if(vis[j]==false&&loadsumw[j]<minn)
            {
                temp = j;
                minn = loadsumw[j];
            }
        }
        if(temp==-1)return ;
        vis[temp] = true;
        for(int j = 0;j<n;j++)
        {
            if(vis[j]==false&&loadw[temp][j]<INF)
            {
                if(loadsumw[j]>loadsumw[temp]+loadw[temp][j])
                {
                    loadsumw[j]=loadsumw[temp]+loadw[temp][j];
                    loadsumc[j] =loadsumc[temp]+loadc[temp][j];
                    path[j].clear();
                    path[j] = path[temp];
                    path[j].push_back(temp);
                }
                else if(loadsumw[j]==loadsumw[temp]+loadw[temp][j])
                {
                    if(loadsumc[j] >loadsumc[temp]+loadc[temp][j])
                    {
                        loadsumc[j] =loadsumc[temp]+loadc[temp][j];
                        path[j].clear();
                        path[j] = path[temp];
                        path[j].push_back(temp);

                    }
                    
                }
            }
        }
        // for(int j = 0;j
        // printf("%d ",loadsumw[j]);
        // cout<
        // for(int j = 0;j
        // printf("%d ",loadsumc[j]);
        // cout<


    }


}
int main()
{
    scanf("%d%d%d%d",&n,&m,&s,&d);
    for(int i = 0;i<n;i++)
    for(int j = 0;j<n;j++)
    loadw[i][j] = INF;
    for(int i = 0;i<m;i++)
    {
        int temp1,temp2;
        scanf("%d %d",&temp1,&temp2);
        scanf("%d %d",&loadw[temp1][temp2],&loadc[temp1][temp2]);
        loadw[temp2][temp1] = loadw[temp1][temp2];
        loadc[temp2][temp1] = loadc[temp1][temp2];
    }
    for(int i = 0;i<n;i++)
    {
        loadsumw[i] = INF;
        loadsumc[i] = INF;
    }
    dijkstra(s);
    for(int i = 0;i<path[d].size();i++)
    printf("%d ",path[d][i]);
    
    printf("%d %d %d\n",d,loadsumw[d],loadsumc[d]);
    return 0;
    
}