Submission #1001971

#	Time	Username	Problem	Language	Result	Execution time	Memory
1001971		vjudge1	Dabbeh (INOI20_dabbeh)	C++17	0 / 100	2061 ms	118928 KiB

Main

#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 p = 37, lg = 20;
const ll N = 5e5 + 5;
ll mod[] = {998244353, (ll)1e9 + 9, (ll)1e9 + 7};
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 = ans * (p & 1 ? n : 1) % mod;
        p >>= 1;
        n = 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[3][N];
array<ll, 3> gethash(ll l, ll r)
{
    if (l > r) return array<ll, 3>{0, 0, 0};
    array<ll, 3> ans = {0, 0, 0};
    for (ll i = 0; i < 3; i++)
        ans[i] = (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 < 3; x++) pw[x][0] = 1;
    for (ll x = 0; x < 3; x++)
    {
        for (ll i = 1; i < N; i++) pw[x][i] = pw[x][i - 1] * p % mod[x];
        for (ll i = 0; i < N; i++) invpw[x][i] = inv(pw[x][i], mod[x]);
    }
//     set<array<ll, 3>> hs;
//     hs.insert({0, 0, 0});
//   	string s;
//     cin >> s;
//     for (string e : t)
//     {
//         array<ll, 3> cur = {0, 0, 0};
//         for (ll j = 0; j < e.size(); j++)
//         { 
//             for (ll x = 0; x < 3; x++)
//             cur[x] = (cur[x] + (e[j] - 'a' + 1) * pw[x][j]) % mod[x];
//             hs.insert(cur);
//         }
//     }
//     for (ll x = 0; x < 3; x++)
//     for (ll i = 0; i < s.size(); i++)
//         pref[x][i] = ((i - 1 < 0 ? 0 : pref[x][i - 1]) + (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;
//         rig[i] = i;
//         while (l <= r)
//         {
//             ll mid = (l + r) >> 1;
//             if (hs.count(gethash(i, mid))) rig[i] = mid + 1, l = mid + 1;
//             else r = mid - 1;
//         }
//     }
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++) hs.insert(x.substr(0, j + 1));
    }
    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());
    rig[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 = 0;
            for (ll bit = lg - 1; bit >= 0; bit--) if (rig[up[bit][l]] < r) ans += 1 << bit, l = up[bit][l];
            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 (stderr)

Main.cpp: In function 'void solve()':
Main.cpp:117:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'const long unsigned int' [-Wsign-compare]
  117 |         for (ll j = 0; j < min(x.size(), s.size()); j++) hs.insert(x.substr(0, j + 1));
      |                        ~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:116:12: warning: unused variable 'cur' [-Wunused-variable]
  116 |         ll cur = 0;
      |            ^~~
Main.cpp:120:22: 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]
  120 |     for (ll i = 0; i < s.size(); i++)
      |                    ~~^~~~~~~~~~
Main.cpp:132:22: 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]
  132 |     for (ll i = 0; i < s.size(); i++) st.set(i, rig[i]);
      |                    ~~^~~~~~~~~~
Main.cpp:136:22: 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]
  136 |     for (ll i = 0; i < s.size(); i++) up[0][i] = rig[i] == i ? i : st.query(i, rig[i]).second;
      |                    ~~^~~~~~~~~~
Main.cpp:139:26: 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]
  139 |         for (ll i = 0; i <= s.size(); i++) up[bit][i] = up[bit - 1][up[bit - 1][i]];
      |                        ~~^~~~~~~~~~~

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