oj.uz

Submission #657095

# Submission time Handle Problem Language Result Execution time Memory
657095 2022-11-08T21:27:11 Z bicsi Necklace (Subtask 1-3) (BOI19_necklace1) C++14
45 / 85
 178 ms 636 KB 
#include <bits/stdc++.h>

using namespace std;
using ld = long double;

using C = complex<ld>;
const ld EPS = 1e-9;

int main() {
  string s, t; cin >> s >> t;

  mt19937_64 rng(52);
  vector<C> rnd(256);
  for (int i = 0; i < 256; ++i) {
    ld real = 1.0L * rng() / rng.max();
    ld imag = 1.0L * rng() / rng.max();
    rnd[i] = C(real, imag);
    rnd[i] /= abs(rnd[i]);
  }
  
  vector<pair<ld, int>> vs, vt;
  auto check = [&](int len) {
    C eps = polar(1.0, 2.0 * M_PI / len);
    pair<int, int> ans = {-1, -1};
    for (int rev = 0; rev < 2; ++rev) {
      vs.clear(); vt.clear();
      for (int it = 0; it < 2; ++it) {
        C h = 0;
        for (int i = 0; i < (int)s.size(); ++i) {
          h = (h + rnd[s[i]]) * eps;
          if (i >= len - 1) {
            vs.emplace_back(norm(h), i - len + 1);
            h -= rnd[s[i - len + 1]];
          }
        }
        swap(s, t); swap(vs, vt);
      }
      sort(vs.begin(), vs.end());
      sort(vt.begin(), vt.end());
      for (int i = 0, j = 0; i < (int)vs.size(); ++i) {
        while (j < vt.size() && vs[i].first + EPS > vt[j].first) {
          if (abs(vt[j].first - vs[i].first) < EPS) {
            ans.first = vs[i].second;
            ans.second = vt[j].second;
            if (rev) ans.first = s.size() - ans.first - len;
          }
          ++j;
        }
      }
      reverse(s.begin(), s.end());
    }
    return ans;
  };

  int ans = 0, ps = -1, pt = -1;
  int bound = 1;
  while (check(bound).first >= 0) bound *= 2;
  for (int i = bound; i >= bound/2; --i) {
    auto [a, b] = check(i);
    if (a >= 0) {
      ans = i, ps = a, pt = b;
      break;
    }
  }
  cout << ans << endl << ps << " " << pt << endl;

  return 0;
}

Compilation message

necklace.cpp: In lambda function:
necklace.cpp:41:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long double, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |         while (j < vt.size() && vs[i].first + EPS > vt[j].first) {
      |                ~~^~~~~~~~~~~
necklace.cpp: In function 'int main()':
necklace.cpp:59:10: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   59 |     auto [a, b] = check(i);
      |          ^

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 3 ms 340 KB Output is correct
7 Correct 4 ms 356 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 3 ms 340 KB Output is correct
10 Correct 8 ms 356 KB Output is correct
11 Correct 5 ms 340 KB Output is correct
12 Correct 4 ms 340 KB Output is correct

Subtask #3
0.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 3 ms 340 KB Output is correct
7 Correct 4 ms 356 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 3 ms 340 KB Output is correct
10 Correct 8 ms 356 KB Output is correct
11 Correct 5 ms 340 KB Output is correct
12 Correct 4 ms 340 KB Output is correct
13 Correct 174 ms 624 KB Output is correct
14 Correct 178 ms 620 KB Output is correct
15 Correct 91 ms 616 KB Output is correct
16 Correct 109 ms 596 KB Output is correct
17 Correct 47 ms 636 KB Output is correct
18 Correct 43 ms 596 KB Output is correct
19 Incorrect 24 ms 596 KB Output isn't correct
20 Halted 0 ms 0 KB -