ACM模板——次短路及K短路

 

 

#define P pair<int,int>
int d[maxn];
int d2[maxn];
int SSC()
{
    priority_queue<P,vector<P>,greater<P>> q;
    memset(d,INF,sizeof(d));
    memset(d2,INF,sizeof(d2));
    
    d[0] = 0;
    q.push(P(0,0));
    
    while(!q.empty())
    {
        P p = q.top();q.pop();
        int dis = p.first,v = p.second;
        if(d2[v] < dis) continue;
        _for(i,0,G[v].size())
        {
            edge &e = G[v][i];
            int dis2 = dis + e.cost;
            if(d[e.to] > dis2)
            {
                swap(d[e.to],dis2);
                q.push(P(d[e.to],e.to));
            }
            if(d2[e.to] > dis2 && d[e.to] < dis2)
            {
                d2[e.to] = dis2;
                q.push(P(d2[e.to],e.to));
            }
        }
    }
    return d2[V-1];
} 

 

 

 

施工中