oj.uz

Submission #657058

# Submission time Handle Problem Language Result Execution time Memory
657058 2022-11-08T19:42:48 Z bicsi Necklace (Subtask 1-3) (BOI19_necklace1) C++14
45 / 85
 54 ms 464 KB 
#include <bits/stdc++.h>

using namespace std;
using ld = long double;

using C = complex<ld>;
const ld EPS = 1e-7;

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]);
  }

  auto cmp = [&](const pair<C, int>& aa, const pair<C, int>& bb) {
    auto& a = aa.first;
    auto& b = bb.first;
    if (abs(a.real() - b.real()) / 
        max(abs(a.real()), abs(b.real())) > EPS) 
      return a.real() < b.real();
    if (abs(a.imag() - b.imag()) / 
        max(abs(a.imag()), abs(b.imag())) > EPS) 
      return a.imag() < b.imag();
    return false;
  };
  
  vector<pair<C, 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) {
            C now = pow(h, len);
            vs.emplace_back(now, i - len + 1);
            h -= rnd[s[i - len + 1]];
          }
        }
        swap(s, t); swap(vs, vt);
      }
      sort(vs.begin(), vs.end(), cmp);
      sort(vt.begin(), vt.end(), cmp);
      for (int i = 0, j = 0; i < (int)vs.size(); ++i) {
        while (j < vt.size() && !cmp(vs[i], vt[j])) {
          if (!cmp(vt[j], vs[i])) {
            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;
  for (int i = (int)s.size(); i >= 0; --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:54:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<std::complex<long double>, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |         while (j < vt.size() && !cmp(vs[i], vt[j])) {
      |                ~~^~~~~~~~~~~
necklace.cpp: In function 'int main()':
necklace.cpp:70:10: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   70 |     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 2 ms 212 KB Output is correct
4 Correct 2 ms 212 KB Output is correct
5 Correct 3 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 2 ms 212 KB Output is correct
4 Correct 2 ms 212 KB Output is correct
5 Correct 3 ms 212 KB Output is correct
6 Correct 4 ms 212 KB Output is correct
7 Correct 3 ms 212 KB Output is correct
8 Correct 23 ms 320 KB Output is correct
9 Correct 33 ms 464 KB Output is correct
10 Correct 43 ms 356 KB Output is correct
11 Correct 54 ms 328 KB Output is correct
12 Correct 31 ms 304 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 2 ms 212 KB Output is correct
4 Correct 2 ms 212 KB Output is correct
5 Correct 3 ms 212 KB Output is correct
6 Correct 4 ms 212 KB Output is correct
7 Correct 3 ms 212 KB Output is correct
8 Correct 23 ms 320 KB Output is correct
9 Correct 33 ms 464 KB Output is correct
10 Correct 43 ms 356 KB Output is correct
11 Correct 54 ms 328 KB Output is correct
12 Correct 31 ms 304 KB Output is correct
13 Incorrect 1 ms 212 KB Output isn't correct
14 Halted 0 ms 0 KB -