新年好 dfs+dijkstra

#include
using namespace std;
typedef pairPII;
const int N = 2e5+10;
int e[N],ne[N],h[N],w[N],idx;
int n,m;
int st[N];
int dist[10][N];
int st1[10];
int p[10];
int op[10];
int res = 0x3f3f3f3f;
mapmp;

priority_queue,greater<>>heap;

void add(int a,int b,int c){
	e[idx] = b,ne[idx] = h[a],w[idx] = c,h[a] = idx++;
}

void dfs(int u){
	if(u>6){
		int last = 1;
		int reu = 0;
		for(int i=2;i<=6;i++){
			reu+=dist[mp[last]][op[i]];
			last = op[i];
		}
		
		res = min(res,reu);
		return;
	}
	
	for(int i=2;i<=6;i++){
		if(!st1[i]){
			op[u] = p[i];
			st1[i] =1;
			dfs(u+1);
			st1[i] = 0;
		}
	}
}

void dijkstra(int be,int ol)
{
	for(int i=1;i<=n;i++)dist[ol][i] = 0x3f3f3f3f;
	memset(st,0,sizeof st);
	dist[ol][be] = 0;
	heap.push({0,be});
	
	while(heap.size()){
		auto t = heap.top();
		heap.pop();
		
		int distance = t.first,ver = t.second;
		if(st[ver])continue;
		
		for(int i=h[ver];~i;i=ne[i]){
			int j = e[i];
			if(dist[ol][j]>distance+w[i]){
				dist[ol][j] = distance + w[i];
				heap.push({dist[ol][j],j});
			}
		}
	}
	
	
}

int main()
{
	cin>>n>>m;
	p[1] = 1;
	for(int i=2;i<=6;i++)cin>>p[i];
	
	memset(h,-1,sizeof h);
	
	for(int i=1;i<=m;i++){
		int a,b,c;cin>>a>>b>>c;
		add(a,b,c),add(b,a,c);
	}
	
	
	for(int i=1;i<=6;i++)dijkstra(p[i],i),mp[p[i]] = i;
	op[1] = 1;
	dfs(2);
	
	cout<