Submission #742066

#	Time	Username	Problem	Language	Result	Execution time	Memory
742066		GrindMachine	Selling RNA Strands (JOI16_selling_rna)	C++17	35 / 100	1554 ms	88316 KiB

selling_rna

// Om Namah Shivaya

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a, b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a, b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

vector<int> ps = {5791, 8237, 3067, 6991, 3527};
vector<int> mods = {791139137, 433567597, 271149607, 561259969, 222708581};
ll pows[N][2];

void precalc() {
    mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

    shuffle(all(ps), rng);
    shuffle(all(mods), rng);

    rep(j, 2) {
        pows[0][j] = 1;
        rep1(i, N - 1) {
            pows[i][j] = pows[i - 1][j] * ps[j] % mods[j];
        }
    }
}

struct Hash {
    ll a[2];

    Hash() {
        memset(a, 0, sizeof a);
    }

    Hash(ll x, ll y) {
        a[0] = x, a[1] = y;
    }

    Hash operator+(char ch) {
        Hash b;
        ll x = ch - 'A' + 1;

        rep(j, 2) {
            b.a[j] = (a[j] * ps[j] + x) % mods[j];
        }

        return b;
    }

    Hash operator-(Hash h) {
        Hash b;
        rep(j, 2) {
            b.a[j] = (a[j] - h.a[j] + mods[j]) % mods[j];
        }

        return b;
    }

    Hash poww(ll k) {
        Hash b;
        rep(j, 2) {
            b.a[j] = a[j] * pows[k][j] % mods[j];
        }

        return b;
    }

    bool operator==(Hash h) {
        rep(j, 2) {
            if (a[j] != h.a[j]) {
                return false;
            }
        }

        return true;
    }

    bool operator<(const Hash &h) const {
        rep(j, 2) {
            if (a[j] != h.a[j]) {
                return a[j] < h.a[j];
            }
        }

        return false;
    }
};

void solve(int test_case)
{
    precalc();

    ll n, m; cin >> n >> m;
    vector<vector<Hash>> pref_hashes(n), suff_hashes(n);

    rep(i, n) {
        string s; cin >> s;
        Hash hsh;
        rep(j, sz(s)) {
            hsh = hsh + s[j];
            pref_hashes[i].pb(hsh);
        }

        hsh = Hash();

        rev(j, sz(s) - 1, 0) {
            hsh = hsh + s[j];
            suff_hashes[i].pb(hsh);
        }
    }

    while (m--) {
        string p, q; cin >> p >> q;
        ll siz1 = sz(p), siz2 = sz(q);
        reverse(all(q));

        Hash hsh1, hsh2;
        trav(ch, p) hsh1 = hsh1 + ch;
        trav(ch, q) hsh2 = hsh2 + ch;

        ll ans = 0;

        rep(i, n) {
            ll siz = sz(pref_hashes[i]);
            if (siz < max(siz1, siz2)) conts;

            if (hsh1 == pref_hashes[i][siz1 - 1] and hsh2 == suff_hashes[i][siz2 - 1]) {
                ans++;
            }
        }

        cout << ans << endl;
    }
}

int main()
{
    fastio;

    int t = 1;
    // cin >> t;

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

Compilation message (stderr)

selling_rna.cpp: In function 'void solve(int)':
selling_rna.cpp:30:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 | #define rep(i, n) for(int i = 0; i < n; ++i)
      |                                    ^
selling_rna.cpp:151:9: note: in expansion of macro 'rep'
  151 |         rep(j, sz(s)) {
      |         ^~~

• Subtask 1: 10 / 10
• Subtask 2: 25 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 40