POJ1062-昂贵的聘礼

http://poj.org/problem?id=1062

看了别人的题解后写的

#include<iostream>
#include<cstring>
#define INF 0x7fffffff
using namespace std; 
int price[101][101],lv[101],sub[101],dist[101],vist[101],M,N;     
void data_init()   
{
    int i,j,t,u;   
    memset(price,0,sizeof(price));   
    memset(lv,0,sizeof(lv));   
    memset(dist,INF,sizeof(dist));   
    memset(vist,0,sizeof(vist));  
    cin>>M>>N;   
    for(i=1;i<=N;i++)   
    {   
        cin>>price[0][i]>>lv[i]>>sub[i]; 
        for(j=1;j<=sub[i];j++)   
        {   
            cin>>t>>u;
            price[t][i]=u;  
        }   
    }   
}   
int dijkstra()   
{   
    int min,i,j,k;
    for(i=1;i<=N;i++)   
        dist[i]=price[0][i];  
    for(i=1;i<=N;i++)   
    {   
        k=0;   
        min=INF;   
        for(j=1;j<=N;j++)   
        {   
            if(!vist[j]&&min>dist[j]) 
            {   
                min=dist[j];   
                k=j;
            }   
        }   
        if(k==0) 
           break;   
        vist[k]=1;
        for(j=1;j<=N;j++)   
        {   
            if(!vist[j]&&price[k][j]>0&&dist[j]>dist[k]+price[k][j])  
                dist[j]=dist[k]+price[k][j];   
        }   
    }   
    return dist[1]; 
}   
int main(void)   
{
    data_init(); 
    int i,j,temp_price,maxlv,minprice=INF;    
    for(i=1;i<=N;i++)   
    {   
        maxlv=lv[i]; 
        for(j=1;j<=N;j++)  
        {   
            if(lv[j]>maxlv||maxlv-lv[j]>M)   
               vist[j]=1;    
            else  
               vist[j]=0;   
        }   
        temp_price=dijkstra();   
        if(minprice>temp_price)   
           minprice=temp_price;   
    }   
    cout<<minprice<<endl;   
    return 0;   
}