链式前向星实现的堆优化dij求最短路模板

#include<cstdio>
#include<string>
#include<cstdlib>
#include<cmath>
#include<iostream>
#include<cstring>
#include<set>
#include<queue>
#include<algorithm>
#include<vector>
#include<map>
#include<cctype>
#include<stack>
#include<sstream>
#include<list>
#include<assert.h>
#include<bitset>
#include<numeric>
#define debug() puts("++++")
#define gcd(a,b) __gcd(a,b)
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define fi first
#define se second
#define pb push_back
#define sqr(x) ((x)*(x))
#define ms(a,b) memset(a,b,sizeof(a))
#define sz size()
#define be begin()
#define pu push_up
#define pd push_down
#define cl clear()
#define lowbit(x) -x&x
#define all 1,n,1
#define rep(i,x,n) for(int i=(x); i<(n); i++)
#define in freopen("in.in","r",stdin)
#define out freopen("out.out","w",stdout)
using namespace std;
typedef long long LL;
typedef unsigned long long ULL;
typedef pair<int,int> P;
const int INF = 0x3f3f3f3f;
const LL LNF = 1e18;
const int maxn = 1e5+;
const int maxm = 1e6+;
const double PI = acos(-1.0);
const double eps = 1e-;
const int dx[] = {-,,,,,,-,-};
const int dy[] = {,,,-,,-,,-};
int dir[][] = {{,},{,-},{-,},{,}};
const int mon[] = {, , , , , , , , , , , , };
const int monn[] = {, , , , , , , , , , , , };
int head[maxn],vis[maxn],dis[maxn];
int t,n,m,u,v,w,st,ed;
struct node
{
    int v,w,nxt;
}e[maxn<<];
/*struct cmp
{
    bool operator()(int a,int b)
    {
        return dis[a]>dis[b];
    }
};*/
 
int tot=;
void init()
{
    tot=;
    ms(head,-);
    ms(vis,);
    ms(dis,INF);
}
void add(int u,int v,int w)
{
    e[tot].v=v;
    e[tot].w=w;
    e[tot].nxt=head[u];
    head[u]=tot++;
}
void dij(int s,int t)
{
    priority_queue< pair<int,int> > q;
    dis[s]=;
    q.push(make_pair(,s));
    while(!q.empty())
    {
        int u = q.top().second;
        q.pop();
        for(int i=head[u];i!=-;i=e[i].nxt)
        {
            int v = e[i].v;
            if(dis[v]>dis[u]+e[i].w)
            {
                dis[v]=dis[u]+e[i].w;
                q.push(make_pair(-dis[v],v));
            }
        }
    }
    int ans=dis[t];
    if(ans!=INF)
        printf("%d\n",ans);
    else puts("-1");
}
int main()
{
    while(~scanf("%d%d",&n,&m))
    {
        init();
        for(int i=;i<m;i++)
        {
            scanf("%d%d%d",&u,&v,&w);
            add(u,v,w);
            add(v,u,w);
        }
        scanf("%d%d",&st,&ed);
        dij(st,ed);
    }
}
 
/*
【题意】
 
【类型】
 
【分析】
 
【时间复杂度&&优化】
 
【trick】
 
【数据】
*/