Submission #1135361

#	Time	Username	Problem	Language	Result	Execution time	Memory
1135361		Zbyszek99	Cubeword (CEOI19_cubeword)	C++20	100 / 100	727 ms	45224 KiB

cubeword

#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 = 998244353;

ll words[11][65][65];
ll trip[11][65][65][65];

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //random_start();
    int n;
    cin >> n;
    vector<pair<string,pair<int,pii>>> vw;
    set<pair<string,pair<int,pii>>> sw;
    map<char,int> m;
    rep(i,n)
    {
        string s;
        cin >> s;
        int len = siz(s);
        char p = s[0];
        char k = s[len-1];
        vw.pb({s,{len,{p,k}}});
        reverse(all(s));
        vw.pb({s,{len,{k,p}}});
        m[p]++;
        m[k]++;
    }
    int cur = 0;
    forall(it,m)
    {
        m[it.ff] = cur++;
    }
    forall(it,vw)
    {
       // cout << it.ff << " " << it.ss.ff << " " << it.ss.ss.ff << " " << it.ss.ss.ss << " it\n";
        sw.insert({it.ff,{it.ss.ff,{m[it.ss.ss.ff],m[it.ss.ss.ss]}}});
    }
    forall(it,sw)
    {
        words[it.ss.ff][it.ss.ss.ff][it.ss.ss.ss]++;
    }
    ll ans = 0;
    rep2(len,3,10)
    {
        rep(a,cur)
        {
            rep(b,cur)
            {
                rep(c,cur)
                {
                    rep(d,cur)
                    {
                        trip[len][a][b][c] += (words[len][a][d] * words[len][b][d] * words[len][c][d]) % MOD;
                    }
                    trip[len][a][b][c] %= MOD;
                }
            }
        }
    }
    rep2(len,3,10)
    {
        rep(a,cur)
        {
            rep(b,cur)
            {
                rep(c,cur)
                {
                    rep(d,cur)
                    {
                        ans += (((((trip[len][a][b][c] * trip[len][a][b][d]) % MOD) * trip[len][c][d][a]) % MOD) * trip[len][c][d][b]) % MOD;
                    }
                }
            }
        }
    }
    ans %= MOD;
    cout << ans << "\n";
}

• Subtask 1: 21 / 21
• Subtask 2: 29 / 29
• Subtask 3: 34 / 34
• Subtask 4: 16 / 16