Submission #657390

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
657390	2022-11-09 19:11:45	bicsi	Necklace (Subtask 4) (BOI19_necklace4)	C++14	0 / 15	151 ms	628 KiB

necklace

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#include <bits/stdc++.h>
using namespace std;
using ld = long double;
const ld EPS = 1e-8;
int main() {
  string s, t; cin >> s >> t;
  mt19937_64 rng(52);
  vector<complex<ld>> 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] = {real, imag};
  }
  
  vector<pair<ld, int>> vs, vt;
  auto check = [&](int len) {
    complex<ld> eps = polar(1.0L, 2.0L * 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) {
        complex<ld> h = 0;
        for (int i = 0; i < (int)s.size(); ++i) {
          h = (h + rnd[s[i]]) * eps;
          if (i >= len - 1) {
            vs.emplace_back(abs(h), i - len + 1);
            h -= rnd[s[i - len + 1]];
 
 
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Compilation message (stderr)

necklace.cpp: In lambda function:
necklace.cpp:38:18: 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]
   38 |         while (j < vt.size() && vs[i].first + EPS > vt[j].first) {
      |                ~~^~~~~~~~~~~
necklace.cpp: In function 'int main()':
necklace.cpp:56:10: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   56 |     auto [a, b] = check(i);
      |          ^

• Subtask 1: 0 / 15