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MinhNGUYEN2k4

QBSCHOOL || DIJKSTRA

Jan 17th, 2021
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C++ 1.72 KB | None | 0 0
  1. //Nguyen Huu Hoang Minh
  2. #include <bits/stdc++.h>
  3. #define sz(x) int(x.size())
  4. #define all(x) x.begin(),x.end()
  5. #define reset(x) memset(x, 0,sizeof(x))
  6. #define pb push_back
  7. #define mp make_pair
  8. #define fi first
  9. #define se second
  10. #define N 5005
  11. #define remain(x) if (x > MOD) x -= MOD
  12. #define ii pair<int, int>
  13. #define vi vector<int>
  14. #define vii vector< ii >
  15. #define bit(x, i) (((x) >> (i)) & 1)
  16. #define Task "test"
  17. #define int long long
  18.  
  19. using namespace std;
  20.  
  21. typedef long double ld;
  22.  
  23. int n,m;
  24. vector<ii> a[N];
  25. int d[N], f[N];
  26.  
  27. void readfile()
  28. {
  29.     ios_base::sync_with_stdio(false);
  30.     cin.tie(0);cout.tie(0);
  31.     if (fopen(Task".inp","r"))
  32.     {
  33.         freopen(Task".inp","r",stdin);
  34.         //freopen(Task".out","w",stdout);
  35.     }
  36.     cin >> n >> m;
  37.     for(int i=1; i<=m; i++)
  38.     {
  39.         int k,u,v,z;
  40.         cin >> k >> u >> v >> z;
  41.         a[u].pb(ii(v,z));
  42.         if (k==2) a[v].pb(ii(u,z));
  43.     }
  44. }
  45.  
  46. void dijkstra()
  47. {
  48.     priority_queue<ii, vii, greater<ii>>q;
  49.     q.push(ii(0,1));
  50.     for(int i=1; i<=n; i++) d[i] = 9999999999;
  51.     d[1] = 0;
  52.     f[1] = 1;
  53.     while (q.size())
  54.     {
  55.         int u = q.top().se;
  56.         int du = q.top().fi;
  57.         q.pop();
  58.         if (du != d[u]) continue;
  59.         for(int i=0; i<a[u].size(); i++)
  60.         {
  61.             int v = a[u][i].fi;
  62.             int uv = a[u][i].se;
  63.             if (d[v] > d[u] + uv)
  64.             {
  65.                 d[v] = d[u] + uv;
  66.                 f[v] = f[u];
  67.                 q.push(ii(d[v],v));
  68.             }
  69.             else if (d[v] == d[u] + uv) f[v] += f[u];
  70.         }
  71.     }
  72. }
  73.  
  74. void proc()
  75. {
  76.     dijkstra();
  77.     cout << d[n] << ' ' << f[n];
  78. }
  79.  
  80. signed main()
  81. {
  82.     readfile();
  83.     proc();
  84.     return 0;
  85. }
  86.  
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