BZOJ3040:最短路——题解

https://www.lydsy.com/JudgeOnline/problem.php?id=3040

题意rt,使用pb_ds的堆解决本问题。

所以其实就是mark一下的。

不过有人确认过官方不能使用“using namespace __gnu_pbds;”

 

#include<cmath>
#include<queue>
#include<cstdio>
#include<cctype>
#include<cstring>
#include<iostream>
#include<algorithm>
#include<ext/pb_ds/priority_queue.hpp>
using namespace std;
typedef long long ll;
typedef pair<ll,int>pii;
typedef __gnu_pbds::priority_queue<pii,greater<pii>,__gnu_pbds::pairing_heap_tag> heap;
#define fi first
#define se second
const int N=1e6+5;
const int M=1e7+5;
const ll INF=1e18;
inline int read(){
    int X=0,w=0;char ch=0;
    while(!isdigit(ch)){w|=ch=='-';ch=getchar();}
    while(isdigit(ch))X=(X<<3)+(X<<1)+(ch^48),ch=getchar();
    return w?-X:X;
}
struct node{
    int to,nxt;
    ll w;
}e[M];
int n,m,c,cnt,head[N];
heap q;
heap::point_iterator id[N];
inline void add(int u,int v,ll w){
    e[++cnt].to=v;e[cnt].w=w;e[cnt].nxt=head[u];head[u]=cnt;
}
ll dis[N];
void dij(int s){
    for(int i=1;i<=n;i++)dis[i]=INF;
    dis[s]=0;id[s]=q.push(pii(0,s));
    while(!q.empty()){
        int u=q.top().se;q.pop();
        for(int i=head[u];i;i=e[i].nxt){
            int v=e[i].to;ll w=e[i].w;
            if(dis[v]>dis[u]+w){
                dis[v]=dis[u]+w;
                if(id[v]!=0)q.modify(id[v],pii(dis[v],v));
                else id[v]=q.push(pii(dis[v],v));
            }
        }
    }
    return;
}
int main(){
    n=read(),m=read();
    int t=read(),rxa=read(),rxc=read(),rya=read(),ryc=read(),rp=read();
    int x=0,y=0;
    for(int i=1;i<=t;i++){
        x=((ll)x*rxa+rxc)%rp;
        y=((ll)y*rya+ryc)%rp;
        int u=min(x%n+1,y%n+1),v=max(y%n+1,y%n+1);
        add(u,v,100000000-100*u);
    }
    for(int i=t+1;i<=m;i++){
        int u=read(),v=read(),w=read();
        add(u,v,w);
    }
    dij(1);
    printf("%lld\n",dis[n]);
    return 0;
}

 

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 +本文作者:luyouqi233。               +

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posted @ 2018-05-28 23:23  luyouqi233  阅读(314)  评论(0编辑  收藏  举报