Submission #1174465

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
1174465	2025-03-27 02:39:23	_ncng.nyr	Cat in a tree (BOI17_catinatree)	C++20	51 / 100	1095 ms	30256 KiB

catinatree

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#include<bits/stdc++.h>
using namespace std;
const int N = 2e5 + 5;
int n, D, it;
int in[N], out[N], h[N];
int up[20][N];
vector<int> ad[N];
void init(int u, int p) {
  in[u] = ++it;
  if(u == 1) for(int i = 0; i <= 18; ++i) up[i][u] = u;
  else for(int i = 1; i <= 18; ++i) up[i][u] = up[i - 1][up[i - 1][u]];
  for(auto v : ad[u]) {
    if(v == p) continue;
    up[0][v] = u;
    h[v] = h[u] + 1;
    init(v, u);
  }
  out[u] = it;
}
int anc(int u, int v) {
  return (in[u] <= in[v] && out[v] <= out[u]);
}
int lca(int u, int v) {
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

catinatree.cpp: In function 'int32_t main()':
catinatree.cpp:86:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   86 |     freopen("task.inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
catinatree.cpp:87:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   87 |     freopen("task.out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 40 / 40
• Subtask 3: 0 / 49