#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll int
#define endl "\n"
using namespace std;
using namespace __gnu_pbds;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<class T> using ordered_set = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;
const ll p = 37, lg = 20;
const ll N = 5e5 + 5;
ll mod[] = {998244353, (ll)1e9 + 9};
ll pw[3][N], invpw[3][N];
ll up[lg][N];
ll binpow(ll n, ll p, ll mod)
{
n %= mod;
ll ans = 1;
while (p)
{
ans = 1ll * ans * (p & 1 ? n : 1) % mod;
p >>= 1;
n = 1ll * n * n % mod;
}
return ans;
}
ll inv(ll n, ll mod)
{
return binpow(n, mod - 2, mod);
}
struct SegTree
{
vector<pair<ll, ll>> st;
ll n;
SegTree(ll sz = 0)
{
n = sz;
st.resize(n << 1, make_pair(0, 0));
}
void set(ll i, ll v)
{
st[i + n] = make_pair(v, i);
}
void build()
{
for (ll i = n - 1; i >= 1; i--) st[i] = max(st[i << 1], st[i << 1 | 1]);
}
pair<ll, ll> query(ll l, ll r)
{
pair<ll, ll> ans = make_pair(-1, -1);
for (l += n, r += n + 1; l < r; l >>= 1, r >>= 1)
{
if (l & 1) ans = max(ans, st[l++]);
if (r & 1) ans = max(ans, st[--r]);
}
return ans;
}
};
ll pref[2][N];
array<ll, 2> gethash(ll l, ll r)
{
if (l > r) return array<ll, 2>{0, 0};
array<ll, 2> ans = {0, 0};
for (ll i = 0; i < 2; i++)
ans[i] = 1ll * (pref[i][r] - (l - 1 < 0 ? 0 : pref[i][l - 1]) + mod[i]) % mod[i] * invpw[i][l] % mod[i];
return ans;
}
void solve()
{
ll n, q;
cin >> n >> q;
string t[n];
for (string &i : t) cin >> i;
for (ll x = 0; x < 2; x++) pw[x][0] = invpw[x][0] = 1;
for (ll x = 0; x < 2; x++)
{
ll invp = inv(p, mod[x]);
for (ll i = 1; i < N; i++) pw[x][i] = 1ll * pw[x][i - 1] * p % mod[x];
for (ll i = 1; i < N; i++) invpw[x][i] = 1ll * invpw[x][i - 1] * invp % mod[x];
}
set<array<ll, 2>> hs;
hs.insert({0, 0});
string s;
cin >> s;
for (string e : t)
{
array<ll, 2> cur = {0, 0};
for (ll j = 0; j < e.size(); j++)
{
for (ll x = 0; x < 2; x++)
cur[x] = (cur[x] + 1ll * (e[j] - 'a' + 1) * pw[x][j]) % mod[x];
hs.insert(cur);
}
}
for (ll x = 0; x < 2; x++)
for (ll i = 0; i < s.size(); i++)
pref[x][i] = ((i - 1 < 0 ? 0 : pref[x][i - 1]) + 1ll * (s[i] - 'a' + 1) * pw[x][i]) % mod[x];
ll rig[s.size()];
for (ll i = 0; i < s.size(); i++)
{
ll l = i, r = s.size() - 1, mid;
rig[i] = i;
while (l <= r)
{
mid = (l + r) >> 1;
if (hs.count(gethash(i, mid))) rig[i] = mid + 1, l = mid + 1;
else r = mid - 1;
}
}
SegTree st(s.size() + 1);
for (ll i = 0; i < s.size(); i++) st.set(i, rig[i]);
st.set(s.size(), s.size());
st.build();
for (ll i = 0; i < s.size(); i++) up[0][i] = rig[i] == i ? i : st.query(i, rig[i]).second;
up[0][s.size()] = s.size();
for (ll bit = 1; bit < lg; bit++)
for (ll i = 0; i <= s.size(); i++) up[bit][i] = up[bit - 1][up[bit - 1][i]];
while (q--)
{
ll l, r;
cin >> l >> r;
if (rig[l] >= r) cout << "1\n";
else
{
ll ans = 1;
for (ll bit = lg - 1; bit >= 0; bit--) if (rig[up[bit][l]] < r) ans += 1 << bit, l = up[bit][l];
if (rig[up[0][l]] < r) ans = -1;
else ans++;
cout << ans << endl;
}
}
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
ll t = 1;
// precomp();
// cin >> t;
for (ll cs = 1; cs <= t; cs++)
solve();
// cerr << "\nTime elapsed: " << clock() * 1000.0 / CLOCKS_PER_SEC << " ms\n";
}
Compilation message
Main.cpp: In function 'void solve()':
Main.cpp:89:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
89 | for (ll j = 0; j < e.size(); j++)
| ~~^~~~~~~~~~
Main.cpp:97:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
97 | for (ll i = 0; i < s.size(); i++)
| ~~^~~~~~~~~~
Main.cpp:100:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
100 | for (ll i = 0; i < s.size(); i++)
| ~~^~~~~~~~~~
Main.cpp:112:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
112 | for (ll i = 0; i < s.size(); i++) st.set(i, rig[i]);
| ~~^~~~~~~~~~
Main.cpp:115:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
115 | for (ll i = 0; i < s.size(); i++) up[0][i] = rig[i] == i ? i : st.query(i, rig[i]).second;
| ~~^~~~~~~~~~
Main.cpp:118:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
118 | for (ll i = 0; i <= s.size(); i++) up[bit][i] = up[bit - 1][up[bit - 1][i]];
| ~~^~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
12 ms |
8280 KB |
Output is correct |
| 2 |
Correct |
249 ms |
29368 KB |
Output is correct |
| 3 |
Incorrect |
151 ms |
24652 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1200 ms |
48908 KB |
Output is correct |
| 2 |
Execution timed out |
2016 ms |
54900 KB |
Time limit exceeded |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
12 ms |
8280 KB |
Output is correct |
| 2 |
Correct |
249 ms |
29368 KB |
Output is correct |
| 3 |
Incorrect |
151 ms |
24652 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
