oj.uz

Submission #396053

# Submission time Handle Problem Language Result Execution time Memory
396053 2021-04-29T12:03:17 Z usachevd0 Ancient Books (IOI17_books) C++17
22 / 100
 2000 ms 748700 KB 
#include <bits/stdc++.h>
#ifndef DEBUG
  #include "books.h"
#endif

using namespace std;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define all(a) (a).begin(), (a).end()
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
using pil = pair<int, ll>;
using pli = pair<ll, int>;
using pll = pair<ll, ll>;
using ld = long double;
template<typename T1, typename T2> bool chkmin(T1 &x, T2 y) {
  return y < x ? (x = y, true) : false; 
}
template<typename T1, typename T2> bool chkmax(T1 &x, T2 y) {
  return y > x ? (x = y, true) : false;
}
void debug_out() {
  cerr << endl;
}
template<typename T1, typename... T2> void debug_out(T1 A, T2... B) {
  cerr << ' ' << A;
  debug_out(B...);
}
template<typename T> void mdebug_out(T* a, int n) {
  for (int i = 0; i < n; ++i) {
    cerr << a[i] << ' ';
  }
  cerr << endl;
}
#ifdef DEBUG
  #define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
  #define mdebug(a, n) cerr << #a << ": ", mdebug_out(a, n)
#else
  #define debug(...) 1337
  #define mdebug(a, n) 1337
#endif
template<typename T> ostream& operator << (ostream& stream, const vector<T> &v) {
  for (auto& x : v) {
    stream << x << ' ';
  }
  return stream;
}
template<typename T1, typename T2> ostream& operator << (ostream& stream, const pair<T1, T2>& p) {
  return stream << p.first << ' ' << p.second;
}

const int maxN = 1000006;
const int INF32 = 1e9;
int n;

namespace fnw {
  int f[maxN];
  void add(int i) {
    for (++i; i < maxN; i += i & -i) {
      ++f[i];
    } 
  }
  int pref(int i) {
    int ans = 0;
    for (++i; i >= 1; i -= i & -i) {
      ans += f[i];
    }
    return ans;
  }
}

namespace dsu {
  int q[maxN];
  void reset() {
    memset(q, 255, sizeof q);
  }
  int gt(int x) {
    return q[x] < 0 ? x : q[x] = gt(q[x]);
  }
  bool un(int x, int y) {
    x = gt(x);
    y = gt(y);
    if (x == y) return false;
    if (-q[x] < -q[y]) swap(x, y);
    q[x] += q[y];
    q[y] = x;
    return true;
  }
}

ll minimum_walk(vector<int> p, int s) {
  n = p.size();
  ll ans = 0;
  int mn = 1e9;
  int mx = -1e9;
  dsu::reset();
  for (int i = 0; i + 1 < n; ++i) {
    fnw::add(p[i]);
    int r = i + 1 - fnw::pref(i);
    if (r > 0) {
      ans += 2 * r;
      dsu::un(i, i + 1);
      chkmin(mn, i);
      chkmax(mx, i + 1);
    }
  }

  /*if (s == 0) {
    chkmin(mn, 0);
    for (int i = mn; i < mx; ++i) {
      if (dsu::un(i, i + 1)) {
        ans += 2;
      }
    }
    return ans;
  }*/

  vector<int> comp(n, -1);
  vector<int> min_comp(n, +INF32);
  vector<int> max_comp(n, -INF32);
  int C = 0;
  for (int x = 0; x < n; ++x) if (comp[x] == -1 && (p[x] != x || x == s)) {
    int y = x;
    min_comp[C] = x;
    do {
      comp[y] = C;
      chkmax(max_comp[C], y);
      y = p[y];
    } while (y != x);
    ++C;
  }
  debug(comp);

  vector<pii> G[C];
  for (int c = 0; c < C; ++c) {
    int l = min_comp[c];
    int r = max_comp[c];
    for (int i = 0; i < n; ++i) if (comp[i] != c && (p[i] != i || i == s)) {
      int dist;
      if (i < l) dist = l - i;
      else if (i > r) dist = i - r;
      else dist = 0;
      debug(c, comp[i], dist);
      G[c].emplace_back(comp[i], dist);
    }
  }
  vector<int> dist(C, INF32);
  vector<int> par_w(C, 0);
  dist[comp[s]] = 0;
  multiset<pii> pq;
  pq.insert({0, comp[s]});
  while (!pq.empty()) {
    int v = pq.begin()->se;
    int _d = pq.begin()->fi;
    pq.erase(pq.begin());
    if (_d != dist[v]) continue;
    for (auto& e : G[v]) {
      int u = e.fi;
      int w = e.se;
      if (chkmin(dist[u], dist[v] + w)) {
        par_w[u] = w;
        pq.insert(mp(dist[u], u));
      }
    }
  }
  debug(dist);
  /*debug(par_w);
  for (int c = 0; c < C; ++c) {
    ans += 2 * par_w[c];
  }*/
  ans += 2 * (*max_element(all(dist)));
  return ans;
}

#ifdef DEBUG
int32_t main() {
#ifdef DEBUG
  freopen("in", "r", stdin);
#endif
  ios::sync_with_stdio(0);
  cin.tie(0);

  int n, s;
  cin >> n >> s;
  vector<int> p(n);
  for (auto& x : p) cin >> x;
  cout << minimum_walk(p, s) << '\n';

  return 0;
}
#endif

Compilation message

books.cpp: In function 'll minimum_walk(std::vector<int>, int)':
books.cpp:43:22: warning: statement has no effect [-Wunused-value]
   43 |   #define debug(...) 1337
      |                      ^~~~
books.cpp:136:3: note: in expansion of macro 'debug'
  136 |   debug(comp);
      |   ^~~~~
books.cpp:43:22: warning: statement has no effect [-Wunused-value]
   43 |   #define debug(...) 1337
      |                      ^~~~
books.cpp:147:7: note: in expansion of macro 'debug'
  147 |       debug(c, comp[i], dist);
      |       ^~~~~
books.cpp:43:22: warning: statement has no effect [-Wunused-value]
   43 |   #define debug(...) 1337
      |                      ^~~~
books.cpp:170:3: note: in expansion of macro 'debug'
  170 |   debug(dist);
      |   ^~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4172 KB Output is correct
2 Correct 3 ms 4172 KB Output is correct
3 Correct 3 ms 4172 KB Output is correct
4 Correct 3 ms 4172 KB Output is correct
5 Correct 3 ms 4172 KB Output is correct
6 Correct 3 ms 4172 KB Output is correct
7 Correct 2 ms 4172 KB Output is correct
8 Correct 3 ms 4172 KB Output is correct
9 Correct 3 ms 4176 KB Output is correct
10 Correct 2 ms 4172 KB Output is correct
11 Correct 3 ms 4172 KB Output is correct
12 Correct 3 ms 4172 KB Output is correct
13 Correct 2 ms 4172 KB Output is correct
14 Correct 3 ms 4172 KB Output is correct
15 Correct 3 ms 4176 KB Output is correct
16 Correct 3 ms 4172 KB Output is correct
17 Correct 3 ms 4172 KB Output is correct
18 Correct 3 ms 4172 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4172 KB Output is correct
2 Correct 3 ms 4172 KB Output is correct
3 Correct 3 ms 4172 KB Output is correct
4 Correct 3 ms 4172 KB Output is correct
5 Correct 3 ms 4172 KB Output is correct
6 Correct 3 ms 4172 KB Output is correct
7 Correct 2 ms 4172 KB Output is correct
8 Correct 3 ms 4172 KB Output is correct
9 Correct 3 ms 4176 KB Output is correct
10 Correct 2 ms 4172 KB Output is correct
11 Correct 3 ms 4172 KB Output is correct
12 Correct 3 ms 4172 KB Output is correct
13 Correct 2 ms 4172 KB Output is correct
14 Correct 3 ms 4172 KB Output is correct
15 Correct 3 ms 4176 KB Output is correct
16 Correct 3 ms 4172 KB Output is correct
17 Correct 3 ms 4172 KB Output is correct
18 Correct 3 ms 4172 KB Output is correct
19 Correct 3 ms 4300 KB Output is correct
20 Correct 3 ms 4300 KB Output is correct
21 Correct 3 ms 4300 KB Output is correct
22 Correct 8 ms 5440 KB Output is correct
23 Correct 9 ms 6348 KB Output is correct
24 Correct 9 ms 6476 KB Output is correct
25 Correct 10 ms 6732 KB Output is correct
26 Correct 5 ms 5296 KB Output is correct
27 Correct 4 ms 4940 KB Output is correct
28 Correct 3 ms 4684 KB Output is correct
29 Correct 5 ms 5836 KB Output is correct

Subtask #3
0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4172 KB Output is correct
2 Correct 3 ms 4172 KB Output is correct
3 Correct 3 ms 4172 KB Output is correct
4 Correct 3 ms 4172 KB Output is correct
5 Correct 3 ms 4172 KB Output is correct
6 Correct 3 ms 4172 KB Output is correct
7 Correct 2 ms 4172 KB Output is correct
8 Correct 3 ms 4172 KB Output is correct
9 Correct 3 ms 4176 KB Output is correct
10 Correct 2 ms 4172 KB Output is correct
11 Correct 3 ms 4172 KB Output is correct
12 Correct 3 ms 4172 KB Output is correct
13 Correct 2 ms 4172 KB Output is correct
14 Correct 3 ms 4172 KB Output is correct
15 Correct 3 ms 4176 KB Output is correct
16 Correct 3 ms 4172 KB Output is correct
17 Correct 3 ms 4172 KB Output is correct
18 Correct 3 ms 4172 KB Output is correct
19 Correct 3 ms 4300 KB Output is correct
20 Correct 3 ms 4300 KB Output is correct
21 Correct 3 ms 4300 KB Output is correct
22 Correct 8 ms 5440 KB Output is correct
23 Correct 9 ms 6348 KB Output is correct
24 Correct 9 ms 6476 KB Output is correct
25 Correct 10 ms 6732 KB Output is correct
26 Correct 5 ms 5296 KB Output is correct
27 Correct 4 ms 4940 KB Output is correct
28 Correct 3 ms 4684 KB Output is correct
29 Correct 5 ms 5836 KB Output is correct
30 Correct 359 ms 85904 KB Output is correct
31 Correct 434 ms 109472 KB Output is correct
32 Correct 187 ms 34396 KB Output is correct
33 Execution timed out 2122 ms 748700 KB Time limit exceeded
34 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 5196 KB Output is correct
2 Correct 4 ms 5196 KB Output is correct
3 Correct 7 ms 6092 KB Output is correct
4 Incorrect 7 ms 5364 KB 3rd lines differ - on the 1st token, expected: '2094', found: '1592'
5 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4172 KB Output is correct
2 Correct 3 ms 4172 KB Output is correct
3 Correct 3 ms 4172 KB Output is correct
4 Correct 3 ms 4172 KB Output is correct
5 Correct 3 ms 4172 KB Output is correct
6 Correct 3 ms 4172 KB Output is correct
7 Correct 2 ms 4172 KB Output is correct
8 Correct 3 ms 4172 KB Output is correct
9 Correct 3 ms 4176 KB Output is correct
10 Correct 2 ms 4172 KB Output is correct
11 Correct 3 ms 4172 KB Output is correct
12 Correct 3 ms 4172 KB Output is correct
13 Correct 2 ms 4172 KB Output is correct
14 Correct 3 ms 4172 KB Output is correct
15 Correct 3 ms 4176 KB Output is correct
16 Correct 3 ms 4172 KB Output is correct
17 Correct 3 ms 4172 KB Output is correct
18 Correct 3 ms 4172 KB Output is correct
19 Correct 3 ms 4300 KB Output is correct
20 Correct 3 ms 4300 KB Output is correct
21 Correct 3 ms 4300 KB Output is correct
22 Correct 8 ms 5440 KB Output is correct
23 Correct 9 ms 6348 KB Output is correct
24 Correct 9 ms 6476 KB Output is correct
25 Correct 10 ms 6732 KB Output is correct
26 Correct 5 ms 5296 KB Output is correct
27 Correct 4 ms 4940 KB Output is correct
28 Correct 3 ms 4684 KB Output is correct
29 Correct 5 ms 5836 KB Output is correct
30 Correct 359 ms 85904 KB Output is correct
31 Correct 434 ms 109472 KB Output is correct
32 Correct 187 ms 34396 KB Output is correct
33 Execution timed out 2122 ms 748700 KB Time limit exceeded
34 Halted 0 ms 0 KB -