Submission #1001588

#	Time	Username	Problem	Language	Result	Execution time	Memory
1001588		vjudge1	Dabbeh (INOI20_dabbeh)	C++17	0 / 100	2058 ms	147604 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define int long long
#define inf 0x3F3F3F3F

const int MXN = 3e5 + 5;
const int mod = 1e9 + 7;
int base = 1031;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int st[MXN << 2];
int lz[MXN << 2];

void relax(int l, int r, int x)
{
  if (!lz[x]) return;
  st[x] = (r - l + 1);
  lz[x] = 0;
  if (l == r) return;
  lz[2*x] = lz[2*x + 1] = 1;
}
void make(int l, int r, int x, int lx, int rx)
{
  relax(l, r, x);
  if (l > rx || r < lx) return;
  if (l >= lx && r <= rx)
  {
    lz[x] = 1;
    relax(l, r, x);
    return;
  }
  int mid = (l + r) >> 1;
  make(l, mid, 2*x, lx, rx);
  make(mid + 1, r, 2*x + 1, lx, rx);
  st[x] = st[2*x] + st[2*x + 1];
}
int get(int l, int r, int x, int lx, int rx)
{
  if (l > rx || r < lx) return 0;
  relax(l, r, x);
  if (l >= lx && r <= rx) return st[x];
  int mid = (l + r) >> 1;
  return get(l, mid, 2*x, lx, rx) + get(mid + 1, r, 2*x + 1, lx, rx);
}

int add(int a, int b)
{
  return (a + b + mod) % mod;
}
int mult(int a, int b)
{
  return (a * b) % mod;
}
int pw(int a, int b, int c)
{
  a %= c;
  int res = 1;
  while (b)
  {
    if (b & 1) res = mult(res, a);
    a = mult(a, a);
    b >>= 1;
  }
  return res;
}

int ph[MXN], p[MXN], invp[MXN];

int get_hash(int l, int r)
{
  return mult(add(ph[r], -ph[l - 1]), invp[l]);
}

void _HASH(string &s)
{
  for (int i = 1; i < s.length(); i++)
  {
    ph[i] = add(ph[i - 1], mult(p[i], s[i] - 'a' + 1));
  }
}

map<int, int> mp;
int R[MXN];
int ans[MXN];
vector<array<int, 2>> q[MXN];

int inter(array<int, 2> x, array<int, 2> y)
{
  return max(x[0], y[0]) <= min(x[1], y[1]);
}
signed main()
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  base = rng() % mod;
  p[0] = 1, invp[0] = 1;
  for (int i = 1; i < MXN; i++) 
  {
    p[i] = mult(p[i - 1], base);
    invp[i] = pw(p[i], mod - 2, mod);
  }
  int k, m;
  cin >> k >> m;
  string t[k];
  for (int i = 0; i < k; i++) cin >> t[i];
  string s;
  cin >> s;
  int n = s.length();
  s = "#" + s;
  _HASH(s);
  for (int i = 0; i < k; i++)
  {
    int h = 0;
    for (int j = 0; j < t[i].length(); j++)
    {
      h = add(h, mult(t[i][j] - 'a' + 1, p[j]));
      mp[h] = 1;
    }
  }
  for (int i = 1; i <= n; i++)
  {
    int l = i, r = n;
    if (!mp[get_hash(i, i)]) 
    {
      continue;
    }
    while (l < r)
    {
      int mid = (l + r + 1) >> 1;
      if (mp[get_hash(i, mid)]) l = mid;
      else r = mid - 1;
    }
    R[i] = l;
  }
  for (int i = 0; i < m; i++)
  {
    int l, r;
    cin >> l >> r;
    l++;
    q[l].push_back({r, i});
  }
  vector<array<int, 2>> v;
  for (int i = n; i >= 1; i--)
  {
    if (R[i]) 
    {
      make(1, n, 1, i, R[i]);
      while (!v.empty()) 
      {
        if (v.back()[1] <= R[i]) v.pop_back();
        else if (v.size() > 1 && inter(*prev(prev(v.end())), {i, R[i]})) v.pop_back();
        else break;
      }
      v.push_back({i, R[i]});
    }
    for (array<int, 2> &j : q[i])
    {
      if (get(1, n, 1, i, j[0]) != j[0] - i + 1)
      {
        ans[j[1]] = -1;
        continue;
      }
      int l = 0, r = (int)v.size() - 1;
      while (l < r)
      {
        int mid = (l + r + 1) >> 1;
        if (v[mid][1] >= j[0]) l = mid;
        else r = mid - 1;
      }
      ans[j[1]] = (int)v.size() - l;
    }
  }
  for (int i = 0; i < m; i++) cout << ans[i] << '\n';
}

Compilation message (stderr)

Main.cpp: In function 'void _HASH(std::string&)':
Main.cpp:79:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   79 |   for (int i = 1; i < s.length(); i++)
      |                   ~~^~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:117:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  117 |     for (int j = 0; j < t[i].length(); j++)
      |                     ~~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 50