Submission #1246238

#	Time	Username	Problem	Language	Result	Execution time	Memory
1246238		KindaGoodGames	Cubeword (CEOI19_cubeword)	C++20	0 / 100	1137 ms	14932 KiB

cubeword

// #pragma GCC optimize("O3, unroll-loops, Ofast")
#include<bits/stdc++.h>

using namespace std;
#define int long long
#define pii pair<int,int>
#define tiii tuple<char,char,cg>

int mod = 998244353; 
vector<vector<vector<int32_t>>> cnt(8, vector<vector<int32_t>>(7, vector<int32_t>(7)));

vector<int> cur(8);
int pt;
int res = 0;
vector<pii> edges;
set<pii> edgesSet;
void gen(int n){
    if(n == 0){ 
        for(int l = 3; l <= 10; l++){
            int cp = 1;
            for(auto e : edges){
                int v =  cnt[l-3][cur[e.first]][cur[e.second]];
                cp *=v;
                cp %= mod;
                if(cp == 0) break;
            }
        
            res += cp;
            res %= mod;
        }
        return;
    }
    for(int i = 0; i < 7; i++){
        cur[pt++] = i;
        gen(n-1);
        cur[--pt] = 0;
    }   
}

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n;

    cin >> n;

    // vector<tiii> arr(n);

    set<string> occ;
    for(int i = 0; i < n; i++){
        string s;
        cin >> s;
        string r = s;
        reverse(r.begin(),r.end());
        // arr[i] = {s.size(), s[0]-'a', s.back()-'a'};

        if(occ.count(r)   || occ.count(s)) continue; 
        occ.insert(s);
        occ.insert(r);
        char ind1 = s[0]-'a';
        char ind2 = s.back()-'a';
        cnt[s.size()-3][ind1][ind2]++;
    
        if(r != s){
            cnt[r.size()-3][r[0]-'a'][r.back()-'a']++;
        }
    }

    auto start = clock();

    for(int v = 0; v < 4; v++){
        auto ins = [&](int a, int b){
            if(a > b) swap(a,b);
            edgesSet.insert({a,b});
        };

        ins(v, (v+1)%4);
        ins(v, (v+3)%4);
        ins(v, v+4);

        ins(4+v, 4+((v+1)%4));
        ins(4+v, 4+((v+3)%4));
    }
    edges = vector<pii>(edgesSet.begin(),edgesSet.end());
    
    gen(8);
    
     
    cout << res << endl; 
    auto end = clock();
    cout << end - start << "ms elapsed" << endl;
}

• Subtask 1: 0 / 21
• Subtask 2: 0 / 29
• Subtask 3: 0 / 34
• Subtask 4: 0 / 16