POJ 1062

#include<iostream>
#include<stdio.h>
#define MAXN 105
#define inf 10000000
using namespace std;

struct dest
{
    int next;
    int len;
};

struct node
{
    int money;
    int stat;
    int dest_num;
    dest coll[MAXN];
};
int give_ans(int rang_b,int rang_e);
void Dijkstra(int m,int s);
node man[MAXN];
int _m[MAXN][MAXN];
int dij[MAXN];
bool last[MAXN];
int n;
int main()
{
    //freopen("acm.acm","r",stdin);
    int m;
    int i;
    int j;
    int tem;
    int min;
    int rang_begin;
    int rang_end;
    cin>>m>>n;
    memset(last,false,sizeof(last));
    for(i = 0; i < n; ++ i)
    {
        cin>>man[i].money;
        cin>>man[i].stat;
        cin>>man[i].dest_num;
        if(man[i].dest_num == 0)
            last[i] = true;
        for(j = 0; j < man[i].dest_num; ++ j)
        {
            cin>>man[i].coll[j].next;
            -- man[i].coll[j].next;
            cin>>man[i].coll[j].len;
        }
    }
    min = inf;
    for(i = 0; i <= m; ++ i)
    {
        rang_begin = man[0].stat;
        rang_end = rang_begin;
        rang_begin -= (m - i);
        rang_end += i;
    //    cout<<rang_begin<<" "<<rang_end<<endl;
        tem = give_ans(rang_begin,rang_end);
    //    cout<<tem<<"  8888888888888888"<<endl;
        if(tem < min)
            min = tem;
        //cout<<min<<endl;
    }
    if(min != inf)
        cout<<min<<endl;
    else
        cout<<man[0].money<<endl;
}

int give_ans(int rang_b,int rang_e)
{
    int i;
    int j;
    int _min;
    for(i = 0; i < n; ++ i)
    {
        for(j = 0; j < n; ++ j)
        {
            _m[i][j] = inf;
        }
    }
    for(i = 0; i < n; ++ i)        ///////////////敏感地区
    {
        if(man[i].stat >= rang_b && man[i].stat <= rang_e)
        for(j = 0; j < man[i].dest_num; ++ j)
        {
            if(man[man[i].coll[j].next].stat >= rang_b && man[man[i].coll[j].next].stat <= rang_e)
            {
                _m[i][man[i].coll[j].next] = man[i].coll[j].len;
            //    if(man[man[i].coll[j].next].dest_num == 0)
            //        _m[i][man[i].coll[j].next] += man[man[i].coll[j].next].money;
            }
        }
    }
//    cout<<"b    dij"<<endl;
//    for(i = 0; i < n; ++ i)
//    {
//        cout<<i<<" ";
//        for(j = 0; j < n; ++ j)
//        {
//            if(_m[i][j] != inf)
//                cout<<j<<" ";
//        }
//        cout<<endl;
//    }
    Dijkstra(n,0);
//    cout<<"DIJ"<<endl;
    _min = inf;
    for(i = 1; i < n; ++ i)
    {
        if(dij[i] != -1 && dij[i] < _min)
        {
            _min = dij[i];
        }
    }
    return _min;
}


void Dijkstra(int m,int s)
{
    int i;
    int j;
    int min;
    int * mark = new int[m];
    memset(mark,0,m*sizeof(int));
    memset(dij,-1,sizeof(dij));
    dij[s] = 0;
    mark[s] = 1;
    int x;
    int k;
    min = -1;        
    for(i = 0; i < m; ++ i)
    {
        if(_m[s][i] != inf)
            dij[i] = _m[s][i];
    }
    for(k = 0; k < m; k++)        
    {
        min = -1;            
        for(j = 0; j < m; j++)
        {
            if(mark[j] == 0 && dij[j] > 0)
            {
                if(dij[j] < min || min < 0)
                {
                    min = dij[j];
                    x = j;
                }
            }
        }
        //cout<<"7777777777777"<<endl;
        if(min == -1)
            break;
        mark[x] = 1;
        for(i = 0; i < m; ++ i)
        {    
            if(mark[i] == 0 && _m[x][i] != inf)
            {
            
                if(dij[i] < 0 || dij[x] + _m[x][i] < dij[i])
                {
                    dij[i] = dij[x] + _m[x][i];
                }
            }
        }
    }
    for(i = 0; i < m; ++ i)
    {
        if(dij[i] != -1)
        {
            dij[i] += man[i].money;
    //        cout<<dij[i]<<" ";
        }
    }
//    cout<<endl;
    delete []mark;
}

 

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