oj.uz

Submission #1002065

# Submission time Handle Problem Language Result Execution time Memory
1002065 2024-06-19T09:37:29 Z Nelt Dabbeh (INOI20_dabbeh) C++17
50 / 100
 2000 ms 107452 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<int, 2> gethash(ll l, ll r)
{
    if (l > r) return array<int, 2>{0, 0};
    array<int, 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<int, 2>> hs;
    hs.insert({0, 0});
  	string s;
    cin >> s;
    for (string e : t)
    {
        array<int, 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

# Verdict Execution time Memory Grader output
1 Correct 16 ms 16224 KB Output is correct
2 Correct 216 ms 37228 KB Output is correct
3 Correct 204 ms 32576 KB Output is correct
4 Correct 216 ms 37460 KB Output is correct
5 Correct 194 ms 35704 KB Output is correct
6 Correct 240 ms 40560 KB Output is correct
7 Correct 292 ms 42836 KB Output is correct
8 Correct 303 ms 41808 KB Output is correct
9 Correct 281 ms 39408 KB Output is correct
10 Correct 111 ms 24068 KB Output is correct
11 Correct 254 ms 40240 KB Output is correct
12 Correct 104 ms 29060 KB Output is correct
13 Correct 170 ms 35232 KB Output is correct

Subtask #2
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1197 ms 88404 KB Output is correct
2 Correct 1444 ms 94284 KB Output is correct
3 Correct 1148 ms 89228 KB Output is correct
4 Correct 984 ms 84100 KB Output is correct
5 Correct 968 ms 83940 KB Output is correct
6 Correct 1480 ms 94392 KB Output is correct
7 Correct 1418 ms 97152 KB Output is correct
8 Correct 1346 ms 91920 KB Output is correct
9 Correct 1486 ms 95132 KB Output is correct
10 Correct 1602 ms 98724 KB Output is correct
11 Correct 1191 ms 89668 KB Output is correct
12 Correct 1179 ms 88092 KB Output is correct
13 Correct 1715 ms 100532 KB Output is correct
14 Correct 1565 ms 98140 KB Output is correct
15 Correct 796 ms 82192 KB Output is correct
16 Correct 1285 ms 100784 KB Output is correct
17 Correct 834 ms 86404 KB Output is correct
18 Correct 692 ms 86152 KB Output is correct

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 16224 KB Output is correct
2 Correct 216 ms 37228 KB Output is correct
3 Correct 204 ms 32576 KB Output is correct
4 Correct 216 ms 37460 KB Output is correct
5 Correct 194 ms 35704 KB Output is correct
6 Correct 240 ms 40560 KB Output is correct
7 Correct 292 ms 42836 KB Output is correct
8 Correct 303 ms 41808 KB Output is correct
9 Correct 281 ms 39408 KB Output is correct
10 Correct 111 ms 24068 KB Output is correct
11 Correct 254 ms 40240 KB Output is correct
12 Correct 104 ms 29060 KB Output is correct
13 Correct 170 ms 35232 KB Output is correct
14 Correct 1197 ms 88404 KB Output is correct
15 Correct 1444 ms 94284 KB Output is correct
16 Correct 1148 ms 89228 KB Output is correct
17 Correct 984 ms 84100 KB Output is correct
18 Correct 968 ms 83940 KB Output is correct
19 Correct 1480 ms 94392 KB Output is correct
20 Correct 1418 ms 97152 KB Output is correct
21 Correct 1346 ms 91920 KB Output is correct
22 Correct 1486 ms 95132 KB Output is correct
23 Correct 1602 ms 98724 KB Output is correct
24 Correct 1191 ms 89668 KB Output is correct
25 Correct 1179 ms 88092 KB Output is correct
26 Correct 1715 ms 100532 KB Output is correct
27 Correct 1565 ms 98140 KB Output is correct
28 Correct 796 ms 82192 KB Output is correct
29 Correct 1285 ms 100784 KB Output is correct
30 Correct 834 ms 86404 KB Output is correct
31 Correct 692 ms 86152 KB Output is correct
32 Correct 698 ms 65364 KB Output is correct
33 Correct 1006 ms 75784 KB Output is correct
34 Correct 1240 ms 80884 KB Output is correct
35 Correct 1123 ms 78296 KB Output is correct
36 Correct 1290 ms 83908 KB Output is correct
37 Correct 710 ms 65040 KB Output is correct
38 Correct 1848 ms 104936 KB Output is correct
39 Correct 1458 ms 94276 KB Output is correct
40 Execution timed out 2051 ms 107452 KB Time limit exceeded
41 Halted 0 ms 0 KB -