oj.uz

답안 #1002062

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1002062 2024-06-19T09:35:48 Z Nelt Dabbeh (INOI20_dabbeh) C++17
25 / 100
 2000 ms 104576 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 p = 37, lg = 20;
const ll N = 5e5 + 5;
ll mod[] = {998244353, (ll)1e9 + 9};
long long 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: 'long long 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: '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++)
      |                    ~~^~~~~~~~~~
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++)
      |                    ~~^~~~~~~~~~
Main.cpp:112:22: 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]
  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: 'long long 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: 'long long 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]];
      |                        ~~^~~~~~~~~~~

Subtask #1
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 16216 KB Output is correct
2 Correct 223 ms 43112 KB Output is correct
3 Correct 164 ms 36876 KB Output is correct
4 Correct 212 ms 43348 KB Output is correct
5 Correct 201 ms 40788 KB Output is correct
6 Correct 258 ms 47144 KB Output is correct
7 Correct 304 ms 50344 KB Output is correct
8 Correct 270 ms 48976 KB Output is correct
9 Correct 231 ms 45648 KB Output is correct
10 Correct 91 ms 25424 KB Output is correct
11 Correct 214 ms 47000 KB Output is correct
12 Correct 121 ms 32540 KB Output is correct
13 Correct 169 ms 40540 KB Output is correct

Subtask #2
0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1229 ms 90864 KB Output is correct
2 Correct 1494 ms 98796 KB Output is correct
3 Correct 1295 ms 92184 KB Output is correct
4 Correct 947 ms 85292 KB Output is correct
5 Correct 971 ms 85104 KB Output is correct
6 Correct 1581 ms 98864 KB Output is correct
7 Correct 1661 ms 102232 KB Output is correct
8 Correct 1325 ms 95612 KB Output is correct
9 Correct 1583 ms 100000 KB Output is correct
10 Correct 1889 ms 104576 KB Output is correct
11 Correct 1244 ms 92472 KB Output is correct
12 Correct 1123 ms 90336 KB Output is correct
13 Execution timed out 2073 ms 50560 KB Time limit exceeded
14 Halted 0 ms 0 KB -

Subtask #3
0 / 50.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 16216 KB Output is correct
2 Correct 223 ms 43112 KB Output is correct
3 Correct 164 ms 36876 KB Output is correct
4 Correct 212 ms 43348 KB Output is correct
5 Correct 201 ms 40788 KB Output is correct
6 Correct 258 ms 47144 KB Output is correct
7 Correct 304 ms 50344 KB Output is correct
8 Correct 270 ms 48976 KB Output is correct
9 Correct 231 ms 45648 KB Output is correct
10 Correct 91 ms 25424 KB Output is correct
11 Correct 214 ms 47000 KB Output is correct
12 Correct 121 ms 32540 KB Output is correct
13 Correct 169 ms 40540 KB Output is correct
14 Correct 1229 ms 90864 KB Output is correct
15 Correct 1494 ms 98796 KB Output is correct
16 Correct 1295 ms 92184 KB Output is correct
17 Correct 947 ms 85292 KB Output is correct
18 Correct 971 ms 85104 KB Output is correct
19 Correct 1581 ms 98864 KB Output is correct
20 Correct 1661 ms 102232 KB Output is correct
21 Correct 1325 ms 95612 KB Output is correct
22 Correct 1583 ms 100000 KB Output is correct
23 Correct 1889 ms 104576 KB Output is correct
24 Correct 1244 ms 92472 KB Output is correct
25 Correct 1123 ms 90336 KB Output is correct
26 Execution timed out 2073 ms 50560 KB Time limit exceeded
27 Halted 0 ms 0 KB -