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Submission #1001847

# Submission time Handle Problem Language Result Execution time Memory
1001847 2024-06-19T08:02:27 Z vjudge1 Dabbeh (INOI20_dabbeh) C++17
25 / 100
 2000 ms 141032 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#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 mod = 998244353, p = 37, lg = 20;
const ll N = 5e5 + 5;
ll pw[N], invpw[N];
ll up[lg][N];
ll binpow(ll n, ll p)
{
    n %= mod;
    ll ans = 1;
    while (p)
    {
        ans = ans * (p & 1 ? n : 1) % mod;
        p >>= 1;
        n = n * n % mod;
    }
    return ans;
}
ll inv(ll n)
{
    return binpow(n, mod - 2);
}
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;
    }
};
void solve()
{
    ll n, q;
    cin >> n >> q;
    string t[n];
    for (string &i : t) cin >> i;
    pw[0] = 1;
    for (ll i = 1; i < N; i++) pw[i] = pw[i - 1] * p % mod;
    for (ll i = 0; i < N; i++) invpw[i] = inv(pw[i]);
    set<string> hs;
    hs.insert("");
  	string s;
    cin >> s;
    for (string x : t)
    {
        ll cur = 0;
        for (ll j = 0; j < min(x.size(), s.size()); j++) cur = (cur + (x[j] - 'a' + 1) * pw[j]) % mod, hs.insert(x.substr(0, j + 1));
    }
    ll pref[s.size()];
    for (ll i = 0; i < s.size(); i++)
        pref[i] = ((i - 1 < 0 ? 0 : pref[i - 1]) + (s[i] - 'a' + 1) * pw[i]) % mod;
    auto gethash = [&](ll l, ll r)
    {
        return l > r ? 0 : (pref[r] - (l == 0 ? 0 : pref[l - 1]) + mod) % mod * invpw[l] % mod;
    };
    ll rig[s.size()];
    for (ll i = 0; i < s.size(); i++)
    {
        ll l = i, r = s.size() - 1;
        rig[i] = i;
        while (l <= r)
        {
            ll mid = (l + r) >> 1;
            if (hs.count(s.substr(i, mid - i + 1))) 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;
        ll ans = 0;
        while (l < r) 
        {
            if (rig[l] >= r)
            {
                ans++;
                break;
            }
            if (l == up[0][l])
            {
                ans = -1;
                break;
            }
            l = up[0][l], 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:75:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'const long unsigned int' [-Wsign-compare]
   75 |         for (ll j = 0; j < min(x.size(), s.size()); j++) cur = (cur + (x[j] - 'a' + 1) * pw[j]) % mod, hs.insert(x.substr(0, j + 1));
      |                        ~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:78:22: 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]
   78 |     for (ll i = 0; i < s.size(); i++)
      |                    ~~^~~~~~~~~~
Main.cpp:85:22: 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]
   85 |     for (ll i = 0; i < s.size(); i++)
      |                    ~~^~~~~~~~~~
Main.cpp:97:22: 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]
   97 |     for (ll i = 0; i < s.size(); i++) st.set(i, rig[i]);
      |                    ~~^~~~~~~~~~
Main.cpp:100:22: 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]
  100 |     for (ll i = 0; i < s.size(); i++) up[0][i] = rig[i] == i ? i : st.query(i, rig[i]).second;
      |                    ~~^~~~~~~~~~
Main.cpp:103:26: 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]
  103 |         for (ll i = 0; i <= s.size(); i++) up[bit][i] = up[bit - 1][up[bit - 1][i]];
      |                        ~~^~~~~~~~~~~
Main.cpp:80:10: warning: variable 'gethash' set but not used [-Wunused-but-set-variable]
   80 |     auto gethash = [&](ll l, ll r)
      |          ^~~~~~~

Subtask #1
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 47312 KB Output is correct
2 Correct 214 ms 81488 KB Output is correct
3 Correct 226 ms 91272 KB Output is correct
4 Correct 311 ms 95828 KB Output is correct
5 Correct 275 ms 117664 KB Output is correct
6 Correct 297 ms 107568 KB Output is correct
7 Correct 189 ms 61220 KB Output is correct
8 Correct 302 ms 117788 KB Output is correct
9 Correct 283 ms 141032 KB Output is correct
10 Correct 174 ms 63824 KB Output is correct
11 Correct 109 ms 48476 KB Output is correct
12 Correct 105 ms 48216 KB Output is correct
13 Correct 111 ms 48288 KB Output is correct

Subtask #2
0 / 25.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2077 ms 33728 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 70 ms 47312 KB Output is correct
2 Correct 214 ms 81488 KB Output is correct
3 Correct 226 ms 91272 KB Output is correct
4 Correct 311 ms 95828 KB Output is correct
5 Correct 275 ms 117664 KB Output is correct
6 Correct 297 ms 107568 KB Output is correct
7 Correct 189 ms 61220 KB Output is correct
8 Correct 302 ms 117788 KB Output is correct
9 Correct 283 ms 141032 KB Output is correct
10 Correct 174 ms 63824 KB Output is correct
11 Correct 109 ms 48476 KB Output is correct
12 Correct 105 ms 48216 KB Output is correct
13 Correct 111 ms 48288 KB Output is correct
14 Execution timed out 2077 ms 33728 KB Time limit exceeded
15 Halted 0 ms 0 KB -