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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. typedef long long int ll;
  5. #define IOS ios_base::sync_with_stdio(0);  cin.tie(0); cout.tie(0);
  6.  
  7.  
  8. #include <ext/pb_ds/assoc_container.hpp>
  9. #include <ext/pb_ds/tree_policy.hpp>
  10. using namespace __gnu_pbds;
  11.  
  12. typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>order_set;
  13. typedef pair<int, int>pr;
  14. #define all(i)     i.begin() , i.end()
  15. #define ft     first
  16. #define sn     second
  17. #define pb push_back
  18.  
  19. #define en "\n"
  20. #define dbg cout<<"rony\n"
  21.  
  22. #define MAXN 20010
  23. #define inf 1e6+5
  24. const ll mod = 1e9 + 7;
  25.  
  26. vector<int>g[MAXN];
  27. int n, q;
  28. int up[MAXN][20];
  29. int dis[MAXN];
  30.  
  31. void dfs(int nd)
  32. {
  33.     for (auto i : g[nd]) {
  34.         up[i][0] = nd;
  35.         dis[i] = dis[nd] + 1;
  36.  
  37.         for (int log = 1; log < 20; log++) {
  38.             int ancestor = up[i][log - 1];
  39.             up[i][log] = up[ancestor][log - 1];
  40.         }
  41.         dfs(i);
  42.     }
  43. }
  44.  
  45. int get_lca(int x, int y)
  46. {
  47.     if (dis[x] < dis[y]) swap(x, y);
  48.  
  49.     int k = dis[x] - dis[y];
  50.     for (int log = 19; log >= 0; log--)
  51.     {
  52.         if (k & (1 << log)) {
  53.             x = up[x][log];
  54.         }
  55.     }
  56.     if (x == y) return x;
  57.  
  58.     for (int log = 19; log >= 0; log--)
  59.     {
  60.         if (up[x][log] != up[y][log])
  61.         {
  62.             x = up[x][log];
  63.             y = up[y][log];
  64.         }
  65.     }
  66.     return up[x][0];
  67. }
  68. void solve()
  69. {
  70.     cin >> n;
  71.     for (int i = 0; i < n; i++)
  72.     {
  73.         int m; cin >> m;
  74.         for (int j = 0; j < m; j++) {
  75.             int x;
  76.             cin >> x;
  77.             g[i].pb(x);
  78.         }
  79.     }
  80.  
  81.     dfs(0);
  82.  
  83.     int q;
  84.     cin >> q;
  85.     while (q--)
  86.     {
  87.         int x, y;
  88.         cin >> x >> y;
  89.  
  90.         cout << get_lca(x, y) << en;
  91.     }
  92. }
  93. int main()
  94. {
  95.     IOS;
  96.     ll t;
  97.     t = 1;
  98.  
  99.     // cin >> t;
  100.  
  101.     int c = 0;
  102.     while ( t-- )
  103.     {
  104.         // cout<<"Case "<<++c<<": ";
  105.         solve();
  106.     }
  107.     return 0;
  108. }
Success #stdin #stdout 0.01s 5504KB
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https://ideone.com/zEd3aT
problem LCASQ, based on SPOJ submission 31400505 (CPP14), 2023-05-24 16:22:35
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
secret

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