oj.uz

답안 #210123

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
210123 2020-03-16T15:05:54 Z waynetuinfor Cats or Dogs (JOI18_catdog) C++17
100 / 100
 961 ms 52984 KB 
#include <algorithm>
#include <cassert>
#include <iostream>
#include <vector>

#include "catdog.h"

constexpr int kInf = 1'000'000;

std::vector<std::vector<int>> g, nd;
std::vector<int> sz, to, fa, fr, dep, ksz;

void Dfs(int x, int p) {
  sz[x] = 1;
  fa[x] = p;
  for (int u : g[x]) {
    if (u == p) continue;
    dep[u] = dep[x] + 1;
    Dfs(u, x);
    sz[x] += sz[u];
    if (to[x] == -1 || sz[u] > sz[to[x]]) to[x] = u;
  }
}

void Link(int x, int f) {
  fr[x] = f;
  if (to[x] != -1) Link(to[x], f);
  for (int u : g[x]) {
    if (u == fa[x] || u == to[x]) continue;
    Link(u, u);
  }
}

struct IntervalTree {
  int n;
  std::vector<std::vector<int>> tree;
  std::vector<std::vector<int>> aux;

  IntervalTree() = default;
  IntervalTree(int n)
      : n(n), tree(n * 4, std::vector<int>(4)), aux(n, std::vector<int>(2)) {
    for (auto &v : tree) {
      v[1] = kInf;
      v[2] = kInf;
    }
  }

  std::vector<int> Merge(const std::vector<int> &a, const std::vector<int> &b,
                         int p) {
    std::vector<int> res(4, kInf);
    for (int i = 0; i < 4; ++i) {
      for (int j = 0; j < 4; ++j) {
        res[(i & 2) | (j & 1)] = std::min(
            res[(i & 2) | (j & 1)],
            a[i] + b[j] + ((i & 1) != (j >> 1 & 1)) + aux[p][j >> 1 & 1]);
      }
    }
    return res;
  }

  void UpdateAux(int p, const std::vector<int> &v) {
    auto Impl = [&](auto self, int l, int r, int o = 0) {
      if (r - l == 1) {
        aux[l] = v;
        return;
      }
      int m = (l + r) >> 1;
      if (p < m) {
        self(self, l, m, o * 2 + 1);
      } else {
        self(self, m, r, o * 2 + 2);
      }
      tree[o] = Merge(tree[o * 2 + 1], tree[o * 2 + 2], m);
    };
    Impl(Impl, 0, n);
  }

  void Modify(int p, const std::vector<int> &v) {
    auto Impl = [&](auto self, int l, int r, int o = 0) {
      if (r - l == 1) {
        std::fill(tree[o].begin(), tree[o].end(), kInf);
        for (int i = 0; i < 2; ++i) tree[o][i << 1 | i] = v[i];
        return;
      }
      int m = (l + r) >> 1;
      if (p < m) {
        self(self, l, m, o * 2 + 1);
      } else {
        self(self, m, r, o * 2 + 2);
      }
      tree[o] = Merge(tree[o * 2 + 1], tree[o * 2 + 2], m);
    };
    Impl(Impl, 0, n);
  }

  std::vector<int> Query(int ql, int qr) {
    auto Impl = [&](auto self, int l, int r, int o = 0) {
      if (l >= ql && r <= qr) return tree[o];
      int m = (l + r) >> 1;
      if (qr <= m) return self(self, l, m, o * 2 + 1);
      if (ql >= m) return self(self, m, r, o * 2 + 2);
      return Merge(self(self, l, m, o * 2 + 1), self(self, m, r, o * 2 + 2), m);
    };
    return Impl(Impl, 0, n);
  }
};

std::vector<IntervalTree> tree;

void initialize(int n, std::vector<int> a, std::vector<int> b) {
  g.resize(n);
  for (int i = 0; i < n - 1; ++i) {
    int u = a[i], v = b[i];
    u--, v--;
    g[u].push_back(v);
    g[v].push_back(u);
  }

  sz.assign(n, 0);
  ksz.assign(n, 0);
  to.assign(n, -1);
  fa.assign(n, -1);
  fr.assign(n, -1);
  dep.assign(n, 0);
  tree.assign(n, IntervalTree());

  Dfs(0, -1);
  Link(0, 0);

  for (int i = 0; i < n; ++i) ksz[fr[i]]++;
  for (int i = 0; i < n; ++i) {
    if (fr[i] == i) {
      tree[i] = IntervalTree(ksz[i]);
    }
  }
}

std::vector<int> GetAux(int v) {
  int p = dep[v] - dep[fr[v]];
  return tree[fr[v]].aux[p];
}

std::vector<int> GetValue(int v) {
  int p = dep[v] - dep[fr[v]];
  auto val = tree[fr[v]].Query(p, ksz[fr[v]]);
  std::vector<int> res(2, kInf);
  for (int i = 0; i < 4; ++i) {
    res[i >> 1 & 1] = std::min(res[i >> 1 & 1], val[i]);
  }
  for (int i = 0; i < 2; ++i) res[i] += GetAux(v)[i];
  return res;
}

void UpdateAux(int v, const std::vector<int> &aux) {
  int p = dep[v] - dep[fr[v]];
  tree[fr[v]].UpdateAux(p, aux);
}

int cat(int v) {
  v--;
  std::vector<std::vector<int>> hist;
  for (int w = fr[v]; fa[w] != -1; w = fr[fa[w]]) {
    hist.push_back(GetValue(w));
  }
  tree[fr[v]].Modify(dep[v] - dep[fr[v]], {0, kInf});
  v = fr[v];
  int ptr = 0;
  while (fa[v] >= 0) {
    auto aux = GetAux(fa[v]);
    auto old = hist[ptr];
    aux[0] -= std::min(old[0], old[1] + 1);
    aux[1] -= std::min(old[1], old[0] + 1);
    auto upd = GetValue(v);
    aux[0] += std::min(upd[0], upd[1] + 1);
    aux[1] += std::min(upd[1], upd[0] + 1);
    ptr++;
    // std::cerr << "v = " << v << " fa = " << fa[v] << " upd-aux = " << aux[0]
    // << ", " << aux[1] << std::endl;
    UpdateAux(fa[v], aux);
    v = fr[fa[v]];
  }
  // for (int i = 0; i < g.size(); ++i) {
  //   auto gv = GetValue(i);
  //   std::cerr << "dp[" << i << "][0] = " << gv[0] << std::endl;
  //   std::cerr << "dp[" << i << "][1] = " << gv[1] << std::endl;
  //   auto aux = GetAux(i);
  //   std::cerr << "aux[" << i << "][0] = " << aux[0] << std::endl;
  //   std::cerr << "aux[" << i << "][1] = " << aux[1] << std::endl;
  // }
  // std::cerr << std::endl;
  auto res = GetValue(0);
  return std::min(res[0], res[1]);
}

int dog(int v) {
  v--;
  std::vector<std::vector<int>> hist;
  for (int w = fr[v]; fa[w] != -1; w = fr[fa[w]]) {
    hist.push_back(GetValue(w));
  }
  tree[fr[v]].Modify(dep[v] - dep[fr[v]], {kInf, 0});
  v = fr[v];
  int ptr = 0;
  while (fa[v] >= 0) {
    auto aux = GetAux(fa[v]);
    auto old = hist[ptr];
    aux[0] -= std::min(old[0], old[1] + 1);
    aux[1] -= std::min(old[1], old[0] + 1);
    auto upd = GetValue(v);
    aux[0] += std::min(upd[0], upd[1] + 1);
    aux[1] += std::min(upd[1], upd[0] + 1);
    ptr++;
    UpdateAux(fa[v], aux);
    v = fr[fa[v]];
  }
  // for (int i = 0; i < g.size(); ++i) {
  //   auto gv = GetValue(i);
  //   std::cerr << "dp[" << i << "][0] = " << gv[0] << std::endl;
  //   std::cerr << "dp[" << i << "][1] = " << gv[1] << std::endl;
  //   auto aux = GetAux(i);
  //   std::cerr << "aux[" << i << "][0] = " << aux[0] << std::endl;
  //   std::cerr << "aux[" << i << "][1] = " << aux[1] << std::endl;
  // }
  // std::cerr << std::endl;
  auto res = GetValue(0);
  return std::min(res[0], res[1]);
}

int neighbor(int v) {
  v--;
  std::vector<std::vector<int>> hist;
  for (int w = fr[v]; fa[w] != -1; w = fr[fa[w]]) {
    hist.push_back(GetValue(w));
  }
  tree[fr[v]].Modify(dep[v] - dep[fr[v]], {0, 0});
  v = fr[v];
  int ptr = 0;
  while (fa[v] >= 0) {
    auto aux = GetAux(fa[v]);
    auto old = hist[ptr];
    aux[0] -= std::min(old[0], old[1] + 1);
    aux[1] -= std::min(old[1], old[0] + 1);
    auto upd = GetValue(v);
    aux[0] += std::min(upd[0], upd[1] + 1);
    aux[1] += std::min(upd[1], upd[0] + 1);
    ptr++;
    // std::cerr << "v = " << v << " fa = " << fa[v] << " upd-aux = " << aux[0]
    // << ", " << aux[1] << std::endl;
    UpdateAux(fa[v], aux);
    v = fr[fa[v]];
  }
  // for (int i = 0; i < g.size(); ++i) {
  //   auto gv = GetValue(i);
  //   std::cerr << "dp[" << i << "][0] = " << gv[0] << std::endl;
  //   std::cerr << "dp[" << i << "][1] = " << gv[1] << std::endl;
  //   auto aux = GetAux(i);
  //   std::cerr << "aux[" << i << "][0] = " << aux[0] << std::endl;
  //   std::cerr << "aux[" << i << "][1] = " << aux[1] << std::endl;
  // }
  // std::cerr << std::endl;
  auto res = GetValue(0);
  return std::min(res[0], res[1]);
}

Subtask #1
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 248 KB Output is correct
2 Correct 5 ms 256 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 256 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 256 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 5 ms 256 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 256 KB Output is correct
13 Correct 5 ms 376 KB Output is correct
14 Correct 5 ms 256 KB Output is correct
15 Correct 5 ms 376 KB Output is correct
16 Correct 5 ms 380 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 248 KB Output is correct
2 Correct 5 ms 256 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 256 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 256 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 5 ms 256 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 256 KB Output is correct
13 Correct 5 ms 376 KB Output is correct
14 Correct 5 ms 256 KB Output is correct
15 Correct 5 ms 376 KB Output is correct
16 Correct 5 ms 380 KB Output is correct
17 Correct 8 ms 632 KB Output is correct
18 Correct 8 ms 760 KB Output is correct
19 Correct 7 ms 716 KB Output is correct
20 Correct 5 ms 376 KB Output is correct
21 Correct 6 ms 376 KB Output is correct
22 Correct 6 ms 504 KB Output is correct
23 Correct 8 ms 632 KB Output is correct
24 Correct 8 ms 632 KB Output is correct
25 Correct 7 ms 504 KB Output is correct
26 Correct 6 ms 504 KB Output is correct
27 Correct 5 ms 376 KB Output is correct
28 Correct 6 ms 632 KB Output is correct
29 Correct 7 ms 760 KB Output is correct
30 Correct 6 ms 376 KB Output is correct
31 Correct 6 ms 636 KB Output is correct
32 Correct 6 ms 504 KB Output is correct

Subtask #3
62.0 / 62.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 248 KB Output is correct
2 Correct 5 ms 256 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 256 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 256 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 5 ms 256 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 256 KB Output is correct
13 Correct 5 ms 376 KB Output is correct
14 Correct 5 ms 256 KB Output is correct
15 Correct 5 ms 376 KB Output is correct
16 Correct 5 ms 380 KB Output is correct
17 Correct 8 ms 632 KB Output is correct
18 Correct 8 ms 760 KB Output is correct
19 Correct 7 ms 716 KB Output is correct
20 Correct 5 ms 376 KB Output is correct
21 Correct 6 ms 376 KB Output is correct
22 Correct 6 ms 504 KB Output is correct
23 Correct 8 ms 632 KB Output is correct
24 Correct 8 ms 632 KB Output is correct
25 Correct 7 ms 504 KB Output is correct
26 Correct 6 ms 504 KB Output is correct
27 Correct 5 ms 376 KB Output is correct
28 Correct 6 ms 632 KB Output is correct
29 Correct 7 ms 760 KB Output is correct
30 Correct 6 ms 376 KB Output is correct
31 Correct 6 ms 636 KB Output is correct
32 Correct 6 ms 504 KB Output is correct
33 Correct 554 ms 24296 KB Output is correct
34 Correct 195 ms 29432 KB Output is correct
35 Correct 479 ms 16752 KB Output is correct
36 Correct 881 ms 41664 KB Output is correct
37 Correct 44 ms 13816 KB Output is correct
38 Correct 961 ms 46640 KB Output is correct
39 Correct 947 ms 46568 KB Output is correct
40 Correct 935 ms 46568 KB Output is correct
41 Correct 961 ms 46568 KB Output is correct
42 Correct 880 ms 46568 KB Output is correct
43 Correct 924 ms 46616 KB Output is correct
44 Correct 879 ms 46568 KB Output is correct
45 Correct 916 ms 46572 KB Output is correct
46 Correct 918 ms 46568 KB Output is correct
47 Correct 914 ms 46580 KB Output is correct
48 Correct 184 ms 34368 KB Output is correct
49 Correct 211 ms 43632 KB Output is correct
50 Correct 71 ms 8972 KB Output is correct
51 Correct 88 ms 17140 KB Output is correct
52 Correct 43 ms 8952 KB Output is correct
53 Correct 405 ms 45048 KB Output is correct
54 Correct 274 ms 19448 KB Output is correct
55 Correct 723 ms 31856 KB Output is correct
56 Correct 429 ms 21152 KB Output is correct
57 Correct 522 ms 41336 KB Output is correct
58 Correct 62 ms 19700 KB Output is correct
59 Correct 84 ms 15480 KB Output is correct
60 Correct 183 ms 38640 KB Output is correct
61 Correct 204 ms 40176 KB Output is correct
62 Correct 134 ms 32752 KB Output is correct
63 Correct 107 ms 26872 KB Output is correct
64 Correct 108 ms 29944 KB Output is correct
65 Correct 139 ms 49020 KB Output is correct
66 Correct 150 ms 11476 KB Output is correct
67 Correct 150 ms 34040 KB Output is correct
68 Correct 306 ms 49656 KB Output is correct
69 Correct 73 ms 3832 KB Output is correct
70 Correct 19 ms 888 KB Output is correct
71 Correct 130 ms 20984 KB Output is correct
72 Correct 198 ms 38520 KB Output is correct
73 Correct 482 ms 52984 KB Output is correct
74 Correct 497 ms 49528 KB Output is correct
75 Correct 335 ms 52976 KB Output is correct
76 Correct 327 ms 51704 KB Output is correct
77 Correct 495 ms 49912 KB Output is correct