oj.uz

Submission #657096

# Submission time Handle Problem Language Result Execution time Memory
657096 2022-11-08T21:27:42 Z bicsi Necklace (Subtask 1-3) (BOI19_necklace1) C++14
29 / 85
 237 ms 624 KB 
#include <bits/stdc++.h>

using namespace std;
using ld = long double;

using C = complex<ld>;
const ld EPS = 1e-12;

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 308 KB Output is correct
5 Correct 1 ms 212 KB Output is correct

Subtask #2
4.0 / 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 308 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Partially correct 5 ms 340 KB Output is partially correct
7 Correct 4 ms 340 KB Output is correct
8 Correct 3 ms 340 KB Output is correct
9 Correct 4 ms 356 KB Output is correct
10 Correct 8 ms 348 KB Output is correct
11 Correct 6 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 308 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Partially correct 5 ms 340 KB Output is partially correct
7 Correct 4 ms 340 KB Output is correct
8 Correct 3 ms 340 KB Output is correct
9 Correct 4 ms 356 KB Output is correct
10 Correct 8 ms 348 KB Output is correct
11 Correct 6 ms 340 KB Output is correct
12 Correct 4 ms 340 KB Output is correct
13 Partially correct 237 ms 620 KB Output is partially correct
14 Partially correct 204 ms 596 KB Output is partially correct
15 Partially correct 101 ms 620 KB Output is partially correct
16 Correct 111 ms 620 KB Output is correct
17 Partially correct 219 ms 624 KB Output is partially correct
18 Correct 43 ms 596 KB Output is correct
19 Incorrect 45 ms 620 KB Output isn't correct
20 Halted 0 ms 0 KB -