oj.uz

Submission #546428

# Submission time Handle Problem Language Result Execution time Memory
546428 2022-04-07T14:09:29 Z cadmiumsky_alt Meetings 2 (JOI21_meetings2) C++14
100 / 100
 3381 ms 45544 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("fast-math")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse3,sse4,avx,avx2")
#pragma GCC push_options
#pragma GCC pop_options
using namespace std;
const int nmax = 2e5 + 5;
vector<int> g[nmax]; 
int n;
int rez[nmax];
int supmem[nmax + 100], ptr;
 
namespace Centroid {
  int occ[nmax];
  int area[nmax];
  int nval[nmax];
  int depth[nmax];
  #define norm lasama
  map<pair<int, int> ,int> norm;
  map<int ,int> fpoz;
  namespace AINT {
    int aint[1048576];
    static int len;
    void clean(int node = 1, int cl = 1, int cr = len) {
      aint[node] = 0;
      if(cl == cr)
        return;
      int mid = cl + cr >> 1;
      clean(2 * node, cl, mid);
      clean(2 * node + 1, mid + 1, cr);
    }
    void init(int nlen) { 
      len = nlen; 
      clean();
    }
    void upd(int poz, int val, int node = 1, int cl = 1, int cr = len) {
      if(cl == cr)
        aint[node] = val;
      else {
        int mid = cl + cr >> 1;
        if(poz <= mid)
          upd(poz, val, 2 * node, cl, mid);
        else
          upd(poz, val, 2 * node + 1, mid + 1, cr);
        aint[node] = max(aint[2 * node], aint[2 * node + 1]);
      }
      return;
    } 
    int query(int poz, int node = 1, int cl = 1, int cr = len) {
      if(cr < poz)
        return 0;
      if(poz <= cl)
        return aint[node];
      int mid = cl + cr >> 1;
      return max(query(poz, 2 * node, cl, mid), query(poz, 2 * node + 1, mid + 1, cr));
    }
  };
  void initcentr(int node, int f) {
    area[node] = 1;
    for(auto x : g[node]) {
      if(occ[x] == 0 && x != f)
        initcentr(x, node), area[node] += area[x];
    }
    return;
  }
  int initdepth(int node, int f) {
    if(occ[node])
      return area[node];
    depth[node] = depth[f] + 1;
    area[node] = 1;
    for(auto x : g[node])
      if(x != f)
        area[node] += initdepth(x, node);
    return area[node];
  }
  int findcentr(int node, int f, int thresh) {
    for(auto x : g[node])  {
      if(occ[x] || x == f)
        continue;
      if(area[x] > thresh)
        return findcentr(x, node, thresh);
    }
    return node;
  }
  void aggr(int node, int f, int val) {
    if(val == -1)
      AINT::upd(nval[node], 0);
    else
      AINT::upd(nval[node], depth[node]);
    for(auto x : g[node])
      if(!occ[x] && x != f)
        aggr(x, node, val);
  }
  void bnorm(int node, int f) {
    norm[{area[node], node}];
    for(auto x : g[node]) if(!occ[x] && x != f) bnorm(x, node);
    return;
  }
  void query(int node, int f) {
    int x = AINT::query(fpoz[area[node]]);
    if(x > 0)
      rez[(area[node]) * 2] = max(rez[(area[node]) * 2], x + depth[node] - 1);
    for(auto x : g[node]) if(!occ[x] && x != f) query(x, node);
    return;
  }
  void mkcentr(int node) {
    //cerr << "++++++\n" << node << "\n=====\n";
    int temp;
    initcentr(node, node);
    node = findcentr(node, node, area[node] / 2);
    //cerr << "Centroid is: " << node << '\n';
    depth[node] = 0;
    initdepth(node, node);
    for(int x, i = 0; i < g[node].size(); i++) {
      if(occ[g[node][i]]) {
        swap(g[node][i], g[node].back());
        g[node].pop_back();
        i--;
        continue;
      }
      x = g[node][i];
      norm[{n - area[x], node}];
      bnorm(x, node);
    }
    temp = 0;
    for(auto &[a, b] : norm) {
      b = ++temp;
      if(fpoz.find(a.first) == fpoz.end())
        fpoz[a.first] = b;
      nval[a.second] = b;
    }
    if(temp != 0) {
      AINT::init(temp);
      for(int i = 0; i < g[node].size(); i++)
        aggr(g[node][i], node, 1);
      for(int i = 0, x; i < g[node].size(); i++) {
        x = g[node][i];
        aggr(x, node, -1);
        AINT::upd(temp = norm[{n - area[x], node}], depth[node]);
        query(x, node);
        AINT::upd(temp, 0);
        aggr(x, node, 1);
      }
    }
    fpoz.clear();
    norm.clear();
    occ[node] = 1;
    int L = ptr, R;
    for(auto x : g[node])
      supmem[ptr++] = area[x];
    R = ptr;
    for(auto x : g[node]) {
      area[node] = n - supmem[L++];
      mkcentr(x);
    }
  }
}

int what[nmax];

mt19937 rng(time(0));
int rnd(int x) {
  return rng() % x;
}

int main() {
  srand(time(0));
  cin >> n;
  //for(int i = 1; i <= n; i++)
    //what[i] = i;
  //random_shuffle(what + 1, what + n + 1, rnd);
  for(int x, y, i = 1; i < n; i++) {
    cin >> x >> y;
    //x = what[x];
    //y = what[y];
    g[x].push_back(y);
    g[y].push_back(x);
  }
  Centroid::mkcentr(1);
  for(int i = n; i > 0; i--) {
    if(i % 2 == 0)
      rez[i] = max({1, rez[i + 2], rez[i]});
    else
      rez[i] = 1;
  }
  //cout << "1\n" << 2 + rez[2] << '\n';
  for(int i = 1; i <= n; i++)
    cout << rez[i] << '\n';
}

Compilation message

meetings2.cpp: In function 'void Centroid::AINT::clean(int, int, int)':
meetings2.cpp:29:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   29 |       int mid = cl + cr >> 1;
      |                 ~~~^~~~
meetings2.cpp: In function 'void Centroid::AINT::upd(int, int, int, int, int)':
meetings2.cpp:41:22: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   41 |         int mid = cl + cr >> 1;
      |                   ~~~^~~~
meetings2.cpp: In function 'int Centroid::AINT::query(int, int, int, int)':
meetings2.cpp:55:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   55 |       int mid = cl + cr >> 1;
      |                 ~~~^~~~
meetings2.cpp: In function 'void Centroid::mkcentr(int)':
meetings2.cpp:115:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  115 |     for(int x, i = 0; i < g[node].size(); i++) {
      |                       ~~^~~~~~~~~~~~~~~~
meetings2.cpp:127:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
  127 |     for(auto &[a, b] : norm) {
      |               ^
meetings2.cpp:135:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  135 |       for(int i = 0; i < g[node].size(); i++)
      |                      ~~^~~~~~~~~~~~~~~~
meetings2.cpp:137:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  137 |       for(int i = 0, x; i < g[node].size(); i++) {
      |                         ~~^~~~~~~~~~~~~~~~
meetings2.cpp:149:18: warning: variable 'R' set but not used [-Wunused-but-set-variable]
  149 |     int L = ptr, R;
      |                  ^

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 5016 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 5012 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 3 ms 4984 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 5016 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 5016 KB Output is correct
21 Correct 3 ms 4948 KB Output is correct

Subtask #2
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 5016 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 5012 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 3 ms 4984 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 5016 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 5016 KB Output is correct
21 Correct 3 ms 4948 KB Output is correct
22 Correct 18 ms 5460 KB Output is correct
23 Correct 18 ms 5580 KB Output is correct
24 Correct 19 ms 5572 KB Output is correct
25 Correct 19 ms 5568 KB Output is correct
26 Correct 21 ms 5544 KB Output is correct
27 Correct 19 ms 5560 KB Output is correct
28 Correct 17 ms 5560 KB Output is correct
29 Correct 18 ms 5500 KB Output is correct
30 Correct 18 ms 5576 KB Output is correct
31 Correct 20 ms 5588 KB Output is correct
32 Correct 26 ms 5744 KB Output is correct
33 Correct 23 ms 5840 KB Output is correct
34 Correct 9 ms 5536 KB Output is correct
35 Correct 8 ms 5496 KB Output is correct
36 Correct 18 ms 5544 KB Output is correct
37 Correct 11 ms 5584 KB Output is correct
38 Correct 16 ms 5716 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 3 ms 5016 KB Output is correct
5 Correct 3 ms 4948 KB Output is correct
6 Correct 3 ms 5012 KB Output is correct
7 Correct 3 ms 4948 KB Output is correct
8 Correct 3 ms 4948 KB Output is correct
9 Correct 3 ms 4948 KB Output is correct
10 Correct 3 ms 4984 KB Output is correct
11 Correct 3 ms 4948 KB Output is correct
12 Correct 3 ms 4948 KB Output is correct
13 Correct 3 ms 5016 KB Output is correct
14 Correct 3 ms 4948 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Correct 3 ms 4948 KB Output is correct
18 Correct 3 ms 4948 KB Output is correct
19 Correct 3 ms 4948 KB Output is correct
20 Correct 3 ms 5016 KB Output is correct
21 Correct 3 ms 4948 KB Output is correct
22 Correct 18 ms 5460 KB Output is correct
23 Correct 18 ms 5580 KB Output is correct
24 Correct 19 ms 5572 KB Output is correct
25 Correct 19 ms 5568 KB Output is correct
26 Correct 21 ms 5544 KB Output is correct
27 Correct 19 ms 5560 KB Output is correct
28 Correct 17 ms 5560 KB Output is correct
29 Correct 18 ms 5500 KB Output is correct
30 Correct 18 ms 5576 KB Output is correct
31 Correct 20 ms 5588 KB Output is correct
32 Correct 26 ms 5744 KB Output is correct
33 Correct 23 ms 5840 KB Output is correct
34 Correct 9 ms 5536 KB Output is correct
35 Correct 8 ms 5496 KB Output is correct
36 Correct 18 ms 5544 KB Output is correct
37 Correct 11 ms 5584 KB Output is correct
38 Correct 16 ms 5716 KB Output is correct
39 Correct 2253 ms 30904 KB Output is correct
40 Correct 2113 ms 30464 KB Output is correct
41 Correct 2167 ms 31036 KB Output is correct
42 Correct 2071 ms 31528 KB Output is correct
43 Correct 2054 ms 31420 KB Output is correct
44 Correct 2071 ms 31476 KB Output is correct
45 Correct 3381 ms 39768 KB Output is correct
46 Correct 2702 ms 45544 KB Output is correct
47 Correct 607 ms 31728 KB Output is correct
48 Correct 516 ms 32000 KB Output is correct
49 Correct 2280 ms 31976 KB Output is correct
50 Correct 874 ms 32152 KB Output is correct
51 Correct 1669 ms 38732 KB Output is correct