Submission #714578

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
714578	2023-03-25 05:59:00	Iliya	Railway (BOI17_railway)	C++17	7 / 100	125 ms	27240 KiB

railway

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#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 1e5 + 10, Log = 20;
vector<int> Adj[N];
vector<pair<int, int>> E;
int n, m, k, H[N], P[Log][N], ts, S[N], F[N], O[N];
void PreDFS(int v, int p) 
{
  S[v] = ++ts;
  P[0][v] = p;
  for (int i = 1; i < Log; i++) 
    P[i][v] = P[i - 1][P[i - 1][v]];
  for (int u : Adj[v]) if (u != p)
    H[u] = H[v] + 1, PreDFS(u, v);
  F[v] = ts;
}
int LCA(int u, int v)
{
  if (H[u] < H[v])
    swap(u, v);
  for (int i = 0; i < Log; i++) 
    if ((H[u] - H[v]) & (1 << i))
      u = P[i][u];
  if (u == v)
    return u;
  for (int i = Log - 1; ~i; i--)
    if (P[i][u] != P[i][v])
      u = P[i][u], v = P[i][v];
  return P[0][v];
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

railway.cpp: In function 'int main()':
railway.cpp:39:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |  scanf("%d%d%d", &n, &m, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
railway.cpp:42:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |   int u, v; scanf("%d%d", &u, &v);
      |             ~~~~~^~~~~~~~~~~~~~~~
railway.cpp:50:15: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |   int s; scanf("%d", &s);
      |          ~~~~~^~~~~~~~~~
railway.cpp:55:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |    scanf("%d", &v);
      |    ~~~~~^~~~~~~~~~

• Subtask 1: 0 / 8
• Subtask 2: 0 / 15
• Subtask 3: 7 / 7
• Subtask 4: 0 / 29
• Subtask 5: 0 / 16
• Subtask 6: 0 / 25