oj.uz

Submission #657064

# Submission time Handle Problem Language Result Execution time Memory
657064 2022-11-08T19:49:59 Z bicsi Necklace (Subtask 1-3) (BOI19_necklace1) C++14
45 / 85
 1500 ms 592 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]);
  }

  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()) > EPS) 
      return a.real() < b.real();
    if (abs(a.imag() - 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 = polar(abs(h), arg(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:52:18: 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]
   52 |         while (j < vt.size() && !cmp(vs[i], vt[j])) {
      |                ~~^~~~~~~~~~~
necklace.cpp: In function 'int main()':
necklace.cpp:68:10: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   68 |     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 3 ms 212 KB Output is correct
4 Correct 5 ms 212 KB Output is correct
5 Correct 9 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 3 ms 212 KB Output is correct
4 Correct 5 ms 212 KB Output is correct
5 Correct 9 ms 212 KB Output is correct
6 Correct 7 ms 212 KB Output is correct
7 Correct 6 ms 212 KB Output is correct
8 Correct 64 ms 336 KB Output is correct
9 Correct 90 ms 340 KB Output is correct
10 Correct 123 ms 340 KB Output is correct
11 Correct 141 ms 440 KB Output is correct
12 Correct 88 ms 324 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 3 ms 212 KB Output is correct
4 Correct 5 ms 212 KB Output is correct
5 Correct 9 ms 212 KB Output is correct
6 Correct 7 ms 212 KB Output is correct
7 Correct 6 ms 212 KB Output is correct
8 Correct 64 ms 336 KB Output is correct
9 Correct 90 ms 340 KB Output is correct
10 Correct 123 ms 340 KB Output is correct
11 Correct 141 ms 440 KB Output is correct
12 Correct 88 ms 324 KB Output is correct
13 Partially correct 453 ms 440 KB Output is partially correct
14 Correct 400 ms 368 KB Output is correct
15 Execution timed out 1579 ms 592 KB Time limit exceeded
16 Halted 0 ms 0 KB -