• bzoj晨跑


    #include<cstdio>
    #include<iostream>
    #include<cstring> 
    #include<queue>
    using namespace std;
    const int M=199999;
    int n,m,s,t;int dis[M];;
    int nex[M],head[M],cos[M],to[M],tot,pre[M],cap[M],vis[M],flo[M],id[M];
    struct st2{
        int f,b;
    }a[M];
    int add(int x,int y,int z,int w){
        cos[tot]=z;
        cap[tot]=w;
        nex[++tot]=head[x];
        to[tot]=y;
        head[x]=tot;
    }
    int spfa(int s,int t){
        
        queue <int> q;
        memset(dis,127,sizeof(dis));
        memset(vis,0,sizeof(vis));
        memset(pre,-1,sizeof(pre));
        int INF=dis[0];
        dis[s]=0;
        vis[s]=1;
        q.push(s);
        flo[s]=INF;
        while(!q.empty()){
            int x=q.front();
            vis[x]=0;
            q.pop();
            for(int i=head[x];i;i=nex[i])
            {
                int tmp=to[i];
                if(dis[tmp]>dis[x]+cos[i-1]&&cap[i-1]){
                    dis[tmp]=dis[x]+cos[i-1];
                    pre[tmp]=x;
                    flo[tmp]=min(flo[x],cap[i-1]);
                    id[tmp]=i-1;
                    if(!vis[tmp]){
                    q.push(tmp);
                    vis[tmp]=1;
                    }
                
                }
            }
            
        }
        if(dis[t]>=INF)return 0;
        return 1; 
    }
    
    struct st{
        int cost=0;
        int flow=0;
    }; 
    st  maxflow(int s,int t){
           st a;
        while(spfa(s,t)){
            int k=t;
               while(k!=s){
                cap[id[k]]-=flo[t];
                cap[id[k]^1]+=flo[t];
                
                k=pre[k];
            }
               a.flow++;
               a.cost+=dis[t];
        }
            
            
        return a;
       
    }
    int main(){
        scanf("%d%d",&n,&m);
        for(int i=1;i<=n;i++){
            add(i,n+i,0,1);
            add(n+i,i,0,0);
        }
        int cnt=1;
        for(int i=1;i<=m;i++){
            int x,y,z,w;
            scanf("%d%d%d",&x,&y,&z);
            add(x+n,y,z,1);
            add(y,x+n,-z,0);
        }
        //printf("%d %d",a[1].b,a[n].f);
        st d=maxflow(1+n,n);
        printf("%d %d",d.flow,d.cost);
        return 0;
    } 
    

      

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  • 原文地址:https://www.cnblogs.com/wspl98765/p/6820245.html
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