oj.uz

Submission #396569

# Submission time Handle Problem Language Result Execution time Memory
396569 2021-04-30T10:17:08 Z usachevd0 Ancient Books (IOI17_books) C++14
50 / 100
 728 ms 146092 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 INF32 = 1e9;

ll minimum_walk(vector<int> p, int s) {
  int n = p.size();
  ll Ans = 0;
  for (int i = 0; i < n; ++i) Ans += labs(p[i] - i);

  vector<int> cyc(n, -1);
  vector<int> cl(n, +INF32), cr(n, -INF32);
  int C = 0;
  for (int i = 0; i < n; ++i) {
    if (p[i] != i && cyc[i] == -1) {
      int c = C++;
      cl[c] = cr[c] = i;
      int x = i;
      do {
        cyc[x] = c;
        chkmax(cr[c], x);
        x = p[x];
      } while (x != i);
    }
  }
  if (!C) return 0;
  vector<int> G[C];
  vector<int> GR[C];
  for (int c = 0; c < C; ++c) {
    for (int i = cl[c]; i <= cr[c]; ++i) {
      if (cyc[i] != -1 && cyc[i] != c) {
        G[c].push_back(cyc[i]);
        GR[cyc[i]].push_back(c);
      }
    }
  }
  vector<char> used(C, false);
  vector<int> ord;
  function<void(int)> dfs = [&](int v) {
    used[v] = true;
    for (int& u : G[v])
      if (!used[u])
        dfs(u);
    ord.push_back(v);
  };
  for (int c = 0; c < C; ++c)
    if (!used[c])
      dfs(c);
  reverse(all(ord));
  vector<int> scc(C, -1);
  int S = 0;
  function<void(int)> dfs1 = [&](int v) {
    scc[v] = S;
    for (int& u : GR[v])
      if (scc[u] == -1)
        dfs1(u);
  };
  for (int& v : ord) {
    if (scc[v] == -1) {
      dfs1(v);
      ++S;
    }
  }
  vector<char> src(S, true);
  for (int c = 0; c < C; ++c) {
    for (int d : G[c]) {
      if (scc[c] != scc[d]) {
        src[scc[d]] = false;
      }
    }
  }
  int min_from_s = +INF32;
  for (int i = 0; i < n; ++i) {
    if (cyc[i] != -1 && src[scc[cyc[i]]]) {
      chkmin(min_from_s, labs(i - s));
    }
  }
  Ans += 2 * min_from_s;
  vector<int> sl(S, +INF32), sr(S, -INF32);
  for (int c = 0; c < C; ++c) {
    int s = scc[c];
    chkmin(sl[s], cl[c]);
    chkmax(sr[s], cr[c]);
  }
  vector<pii> segs;
  for (int s = 0; s < S; ++s) {
    if (src[s]) {
      segs.emplace_back(sl[s], sr[s]);
    }
  }
  sort(all(segs));
  for (int i = 0; i + 1 < segs.size(); ++i) {
    int r1 = segs[i].se;
    int l2 = segs[i + 1].fi;
    assert(r1 < l2);
    Ans += 2 * (l2 - r1);
  }
  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:145:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  145 |   for (int i = 0; i + 1 < segs.size(); ++i) {
      |                   ~~~~~~^~~~~~~~~~~~~

Subtask #1
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 208 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 208 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 208 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 208 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 1 ms 204 KB Output is correct
24 Correct 1 ms 204 KB Output is correct
25 Correct 1 ms 204 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 1 ms 332 KB Output is correct
28 Correct 1 ms 336 KB Output is correct
29 Correct 1 ms 332 KB Output is correct

Subtask #3
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 208 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 208 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 1 ms 204 KB Output is correct
24 Correct 1 ms 204 KB Output is correct
25 Correct 1 ms 204 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 1 ms 332 KB Output is correct
28 Correct 1 ms 336 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 317 ms 68560 KB Output is correct
31 Correct 431 ms 100304 KB Output is correct
32 Correct 136 ms 19816 KB Output is correct
33 Correct 173 ms 35800 KB Output is correct
34 Correct 178 ms 35816 KB Output is correct
35 Correct 193 ms 39408 KB Output is correct
36 Correct 246 ms 42512 KB Output is correct
37 Correct 262 ms 56564 KB Output is correct
38 Correct 268 ms 72432 KB Output is correct
39 Correct 274 ms 72672 KB Output is correct
40 Correct 302 ms 83928 KB Output is correct
41 Correct 359 ms 94024 KB Output is correct
42 Correct 375 ms 104696 KB Output is correct
43 Correct 728 ms 146092 KB Output is correct

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 332 KB 3rd lines differ - on the 1st token, expected: '3304', found: '3590'
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 208 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 1 ms 208 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 1 ms 204 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 1 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 1 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 1 ms 204 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 344 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 1 ms 204 KB Output is correct
24 Correct 1 ms 204 KB Output is correct
25 Correct 1 ms 204 KB Output is correct
26 Correct 1 ms 332 KB Output is correct
27 Correct 1 ms 332 KB Output is correct
28 Correct 1 ms 336 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 317 ms 68560 KB Output is correct
31 Correct 431 ms 100304 KB Output is correct
32 Correct 136 ms 19816 KB Output is correct
33 Correct 173 ms 35800 KB Output is correct
34 Correct 178 ms 35816 KB Output is correct
35 Correct 193 ms 39408 KB Output is correct
36 Correct 246 ms 42512 KB Output is correct
37 Correct 262 ms 56564 KB Output is correct
38 Correct 268 ms 72432 KB Output is correct
39 Correct 274 ms 72672 KB Output is correct
40 Correct 302 ms 83928 KB Output is correct
41 Correct 359 ms 94024 KB Output is correct
42 Correct 375 ms 104696 KB Output is correct
43 Correct 728 ms 146092 KB Output is correct
44 Incorrect 1 ms 332 KB 3rd lines differ - on the 1st token, expected: '3304', found: '3590'
45 Halted 0 ms 0 KB -