제출 #537414

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
537414		cig32	Birthday gift (IZhO18_treearray)	C++17	56 / 100	4048 ms	155868 KiB

treearray

#include "bits/stdc++.h"
using namespace std;
const int MAXN = 1e6 + 10;
const int MOD = 1e9 + 7;
#define int long long
 
mt19937_64 rng((int)std::chrono::steady_clock::now().time_since_epoch().count());
int rnd(int x, int y) {
  int u = uniform_int_distribution<int>(x, y)(rng); return u;
}
long long bm(long long b, long long p) { 
  if(p==0) return 1;
  long long r = bm(b, p/2);
  if(p&1) return (((r*r) % MOD) * b) % MOD;
  return (r*r) % MOD;
}
vector<int> adj[MAXN];

pair<int, int> st[19][MAXN];

int l[MAXN], r[MAXN];
vector<int> e;

int dep[MAXN];
void dfs(int node, int prv) {
  e.push_back(node);
  dep[node] = (prv == -1 ? 0 : dep[prv] + 1);
  for(int x: adj[node]) {
    if(x != prv) {
      dfs(x, node);
      e.push_back(node);
    }
  }

}

int lca_idx(int x, int y) {
  int m1 = min(l[x], l[y]), m2 = max(r[x], r[y]);
  int k = 32 - __builtin_clz(m2 - m1 + 1) - 1;
  return min(st[k][m1], st[k][m2 - (1<<k) + 1]).second;
}
void solve(int tc) {
  int n, m, q;
  cin >> n >> m >> q;
  for(int i=1; i<n; i++) {
    int u, v;
    cin >> u >> v;
    adj[u].push_back(v);
    adj[v].push_back(u);
  }
  dfs(1, -1);
  for(int i=0; i<e.size(); i++) st[0][i] = {dep[e[i]], e[i]};
  for(int i=0; i<e.size(); i++) r[e[i]] = i;
  for(int i=e.size() - 1; i>=0; i--) l[e[i]] = i;

  for(int i=1; i<19; i++) {
    for(int j=0; j<e.size(); j++) {
      if(j + (1<<i) - 1 < e.size()) {
        st[i][j] = min(st[i-1][j],st[i-1][j+(1<<(i-1))]);
      }
    }
  }
  int a[m+1];
  for(int i=1; i<=m; i++) cin >> a[i];
  for(int i=1; i<=q; i++) {
    int t;
    cin >> t;
    if(t == 1) {
      int pos, v;
      cin >> pos >> v;
      a[pos] = v;
    }
    else {
      int l, r, v;
      cin >> l >> r >> v;
      int x = -1, y = -1;
      for(int j=l; j<=r; j++) {
        if(a[j] == v) {
          x = j, y = j;
        }
      }
      for(int j=l; j<r; j++) {
        if(lca_idx(a[j], a[j+1]) == v) {
          x = j, y = j + 1;
        }
      }
      cout << x << ' ' << y << "\n";
    }
  }
}

int32_t main(){
  ios::sync_with_stdio(0); cin.tie(0);
  int t = 1; //cin >> t;
  for(int i=1; i<=t; i++) solve(i);
}
/*
5 4 4
1 2
3 1
3 4
5 3
4 5 2 3
2 1 3 1
1 3 5
2 3 4 5
2 1 3 1
*/

컴파일 시 표준 에러 (stderr) 메시지

treearray.cpp: In function 'void solve(long long int)':
treearray.cpp:52:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |   for(int i=0; i<e.size(); i++) st[0][i] = {dep[e[i]], e[i]};
      |                ~^~~~~~~~~
treearray.cpp:53:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |   for(int i=0; i<e.size(); i++) r[e[i]] = i;
      |                ~^~~~~~~~~
treearray.cpp:57:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |     for(int j=0; j<e.size(); j++) {
      |                  ~^~~~~~~~~
treearray.cpp:58:25: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |       if(j + (1<<i) - 1 < e.size()) {
      |          ~~~~~~~~~~~~~~~^~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 18 / 18
• Subtask 3: 26 / 26
• Subtask 4: 0 / 44