Submission #1312985

#	Time	Username	Problem	Language	Result	Execution time	Memory
1312985		Zbyszek99	Selling RNA Strands (JOI16_selling_rna)	C++20	100 / 100	852 ms	225112 KiB

selling_rna

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define ull unsigned long long
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
//mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
//ll los(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;

ll p[2] = {2137,692137};
ll P[2][100001];
unordered_map<ll,int> ans_map;
vi ans_map2[2000001];
pair<string,string> queries[100001];
vl suf_hashes[100001];
int query_ans[100001];

ll hash_string(string& s)
{
    ll h[2];
    h[0] = 0;
    h[1] = 0;
    rep(i,siz(s)) rep(d,2) h[d] = (h[d]+P[d][i]*s[i])%MOD;
    return h[0]+h[1]*MOD;
}

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //random_start();
    rep(d,2)
    {
        P[d][0] = 1;
        rep2(i,1,100000) P[d][i] = (P[d][i-1]*p[d])%MOD;
    }
    int n,q;
    cin >> n >> q;
    vector<pair<string,int>> vsort;
    rep(i,n)
    {
        string s;
        cin >> s;
        reverse(all(s));
        vsort.pb({s,1e9+i});
        ll h[2];
        h[0] = 0;
        h[1] = 0;
        rep(j,siz(s))
        {
            rep(d,2) h[d] = (h[d]+P[d][j]*s[j])%MOD;
            suf_hashes[i].pb(h[0]+h[1]*MOD);
        }
    }
    rep(qq,q)
    {
        string s1,s2;
        cin >> s1 >> s2;
        reverse(all(s2));
        queries[qq] = {s1,s2};
        vsort.pb({s2,qq});
    }
    sort(all(vsort));
    reverse(all(vsort));
    int cur = 1;
    forall(it,vsort)
    {
        if(it.ss >= 1e9)
        {
            it.ss -= 1e9;
            reverse(all(it.ff));
            ll h[2];
            h[0] = 0;
            h[1] = 0;
            rep(i,siz(it.ff))
            {
                rep(d,2) h[d] = (h[d]+P[d][i]*it.ff[i])%MOD;
                if(ans_map.find(h[0]+h[1]*MOD)==ans_map.end()) ans_map[h[0]+h[1]*MOD] = cur++;
                ans_map2[ans_map[h[0]+h[1]*MOD]].pb(it.ss);
            }
        }
        else
        {
            ll hash = hash_string(queries[it.ss].ff);
            ll hash2 = hash_string(it.ff);
            int p = ans_map[hash];
            int l = 0;
            int r = siz(ans_map2[p])-1;
            int ans = siz(ans_map2[p]);
            while(l <= r)
            {
                int mid = (l+r)/2;
                if(siz(it.ff) <= siz(suf_hashes[ans_map2[p][mid]]) && hash2 == suf_hashes[ans_map2[p][mid]][siz(it.ff)-1])
                {
                    ans = mid;
                    r = mid-1;
                }
                else
                {
                    l = mid+1;
                }
            }
            query_ans[it.ss] = siz(ans_map2[p])-ans;
        }
    }
    rep(qq,q) cout << query_ans[qq] << "\n";
}

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