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cf 20C Dijkstra?
带队列 dijkstra
1 #include <iostream> 2 #include <cstdio> 3 #include <queue> 4 #include <vector> 5 #include<memory.h> 6 #include<algorithm>//reverse 7 using namespace std; 8 #define maxn 100002 9 #define INF 6510 struct node11 {12 int u;13 int w;14 node(long long x,long long y)15 {16 u = x;17 w = y;18 }19 bool operator < ( const node& p ) const20 { return w > p.w; }21 };22 vector<long long>g[maxn];23 vector<long long>cost[maxn];24 long long d[maxn];25 long long par[maxn];26 int dijk(int n)27 {28 memset(d, INF, sizeof(d));29 memset(par, -1, sizeof(par));30 priority_queue<node>q;31 q.push(node(1,0));32 d[1]=0;33 while(!q.empty())34 {35 node top = q.top();36 q.pop();37 int uu = top.u;38 if(uu == n) return d[n];39 for(int i = 0;i < g[uu].size(); i++)40 {41 int v = g[uu][i];42 if(d[uu] + cost[uu][i] < d[v])43 {44 d[v] = d[uu] + cost[uu][i];45 par[v] = uu;46 q.push(node(v,d[v]));47 }48 }49 }50 return -1;51 }52 int main()53 {54 //freopen("input.txt","r",stdin);55 int n,e,u,v;56 long long w;57 cin>>n>>e;58 for(int i = 0; i < e; i++)59 {60 cin>>u>>v>>w;61 g[u].push_back(v);cost[u].push_back(w);62 g[v].push_back(u);cost[v].push_back(w);63 64 }65 w = dijk(n);66 if(w == -1) cout<<"-1"<<endl;67 else68 {69 int t = n;70 int s[maxn];71 int k = 0;72 while(t != -1)73 {74 s[k++] = t;75 t = par[t];76 }77 for(int j = k - 1; j >= 0; j--)78 cout<<s[j]<<" ";79 cout<<endl;80 }81 }
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