kyopro-lib-cpp

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(string/rolling_hash.hpp)

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Code

#pragma once

#include "../template.hpp"
#include "../util/xorshift.hpp"

struct rolling_hash {
    static constexpr ull MOD = pw(61) - 1;
    static vector<ull> pbase;
    vector<ull> hash;
    static void resize_pbase(ll n) {
        ll sz = pbase.size();
        if (sz > n) return;
        pbase.resize(n + 1);
        for (ll i : rep(sz - 1, n)) pbase[i + 1] = mul(pbase[i], pbase[1]);
    }
    template <typename T> static T calc_mod(T val) {
        val = (val & MOD) + (val >> 61);
        if (val >= MOD) val -= MOD;
        return val;
    }
    static ull mul(ull a, ull b) { return calc_mod((__uint128_t)a * b); }
    static ull concat(ull lhs, ull rhs, ll rn) {
        resize_pbase(rn);
        return calc_mod(mul(lhs, pbase[rn]) + rhs);
    }
    rolling_hash(const string &src) : hash(src.size() + 1) {
        for (ll i : rep(src.size())) hash[i + 1] = calc_mod(mul(hash[i], pbase[1]) + src[i]);
        resize_pbase(src.size());
    }
    template <typename T> rolling_hash(const vector<T> &src) : hash(src.size() + 1) {
        for (ll i : rep(src.size())) hash[i + 1] = calc_mod(mul(hash[i], pbase[1]) + src[i]);
        resize_pbase(src.size());
    }
    ull get_hash(ll l, ll r) const { return calc_mod(MOD - mul(hash[l], pbase[r - l]) + hash[r]); }
};
vector<ull> rolling_hash::pbase{1, xor64(MOD >> 1, MOD)};
#line 2 "string/rolling_hash.hpp"

#line 2 "template.hpp"

#include <bits/stdc++.h>
using namespace std;

#define all(a) begin(a), end(a)
#define rall(a) rbegin(a), rend(a)
#define uniq(a) (a).erase(unique(all(a)), (a).end())
#define t0 first
#define t1 second
using ll = long long;
using ull = unsigned long long;
using pll = pair<ll, ll>;
using vll = vector<ll>;
constexpr double pi = 3.14159265358979323846;
constexpr ll dy[9] = {0, 1, 0, -1, 1, 1, -1, -1, 0};
constexpr ll dx[9] = {1, 0, -1, 0, 1, -1, -1, 1, 0};
constexpr ll sign(ll a) { return (a > 0) - (a < 0); }
constexpr ll fdiv(ll a, ll b) { return a / b - ((a ^ b) < 0 && a % b); }
constexpr ll cdiv(ll a, ll b) { return -fdiv(-a, b); }
constexpr ll pw(ll n) { return 1ll << n; }
constexpr ll flg(ll n) { return 63 - __builtin_clzll(n); }
constexpr ll clg(ll n) { return n == 1 ? 0 : flg(n - 1) + 1; }
constexpr ll safemod(ll x, ll mod) { return (x % mod + mod) % mod; }
template <typename T> using priority_queue_rev = priority_queue<T, vector<T>, greater<T>>;
template <typename T> constexpr T sq(const T &a) { return a * a; }
template <typename T, typename U> constexpr bool chmax(T &a, const U &b) { return a < b ? a = b, true : false; }
template <typename T, typename U> constexpr bool chmin(T &a, const U &b) { return a > b ? a = b, true : false; }
template <typename T, typename U> ostream &operator<<(ostream &os, const pair<T, U> &a) {
    os << "(" << a.first << ", " << a.second << ")";
    return os;
}
template <typename T, typename U, typename V> ostream &operator<<(ostream &os, const tuple<T, U, V> &a) {
    os << "(" << get<0>(a) << ", " << get<1>(a) << ", " << get<2>(a) << ")";
    return os;
}
template <typename T> ostream &operator<<(ostream &os, const vector<T> &a) {
    os << "(";
    for (auto itr = a.begin(); itr != a.end(); ++itr) os << *itr << (next(itr) != a.end() ? ", " : "");
    os << ")";
    return os;
}
template <typename T> ostream &operator<<(ostream &os, const set<T> &a) {
    os << "(";
    for (auto itr = a.begin(); itr != a.end(); ++itr) os << *itr << (next(itr) != a.end() ? ", " : "");
    os << ")";
    return os;
}
template <typename T> ostream &operator<<(ostream &os, const multiset<T> &a) {
    os << "(";
    for (auto itr = a.begin(); itr != a.end(); ++itr) os << *itr << (next(itr) != a.end() ? ", " : "");
    os << ")";
    return os;
}
template <typename T, typename U> ostream &operator<<(ostream &os, const map<T, U> &a) {
    os << "(";
    for (auto itr = a.begin(); itr != a.end(); ++itr) os << *itr << (next(itr) != a.end() ? ", " : "");
    os << ")";
    return os;
}
#ifdef ONLINE_JUDGE
#define dump(...) (void(0))
#else
void debug() { cerr << endl; }
template <typename Head, typename... Tail> void debug(Head &&head, Tail &&... tail) {
    cerr << head;
    if (sizeof...(Tail)) cerr << ", ";
    debug(tail...);
}
#define dump(...) cerr << __LINE__ << ": " << #__VA_ARGS__ << " = ", debug(__VA_ARGS__)
#endif
struct rep {
    struct itr {
        ll v;
        itr(ll v) : v(v) {}
        void operator++() { ++v; }
        ll operator*() const { return v; }
        bool operator!=(itr i) const { return v < *i; }
    };
    ll l, r;
    rep(ll l, ll r) : l(l), r(r) {}
    rep(ll r) : rep(0, r) {}
    itr begin() const { return l; };
    itr end() const { return r; };
};
struct per {
    struct itr {
        ll v;
        itr(ll v) : v(v) {}
        void operator++() { --v; }
        ll operator*() const { return v; }
        bool operator!=(itr i) const { return v > *i; }
    };
    ll l, r;
    per(ll l, ll r) : l(l), r(r) {}
    per(ll r) : per(0, r) {}
    itr begin() const { return r - 1; };
    itr end() const { return l - 1; };
};
struct io_setup {
    static constexpr int PREC = 20;
    io_setup() {
        cout << fixed << setprecision(PREC);
        cerr << fixed << setprecision(PREC);
    };
} iOS;
#line 2 "util/xorshift.hpp"

#line 4 "util/xorshift.hpp"

template <typename V> V xor64(V lb, V ub) {
    static ull x = 88172645463325252ull;
    x ^= x << 7;
    return lb + (x ^= x >> 9) % (ub - lb);
}
#line 5 "string/rolling_hash.hpp"

struct rolling_hash {
    static constexpr ull MOD = pw(61) - 1;
    static vector<ull> pbase;
    vector<ull> hash;
    static void resize_pbase(ll n) {
        ll sz = pbase.size();
        if (sz > n) return;
        pbase.resize(n + 1);
        for (ll i : rep(sz - 1, n)) pbase[i + 1] = mul(pbase[i], pbase[1]);
    }
    template <typename T> static T calc_mod(T val) {
        val = (val & MOD) + (val >> 61);
        if (val >= MOD) val -= MOD;
        return val;
    }
    static ull mul(ull a, ull b) { return calc_mod((__uint128_t)a * b); }
    static ull concat(ull lhs, ull rhs, ll rn) {
        resize_pbase(rn);
        return calc_mod(mul(lhs, pbase[rn]) + rhs);
    }
    rolling_hash(const string &src) : hash(src.size() + 1) {
        for (ll i : rep(src.size())) hash[i + 1] = calc_mod(mul(hash[i], pbase[1]) + src[i]);
        resize_pbase(src.size());
    }
    template <typename T> rolling_hash(const vector<T> &src) : hash(src.size() + 1) {
        for (ll i : rep(src.size())) hash[i + 1] = calc_mod(mul(hash[i], pbase[1]) + src[i]);
        resize_pbase(src.size());
    }
    ull get_hash(ll l, ll r) const { return calc_mod(MOD - mul(hash[l], pbase[r - l]) + hash[r]); }
};
vector<ull> rolling_hash::pbase{1, xor64(MOD >> 1, MOD)};
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