Submission #546607

#TimeUsernameProblemLanguageResultExecution timeMemory
546607LucaDantasCubeword (CEOI19_cubeword)C++17
50 / 100
268 ms15692 KiB
#pragma GCC optimize("Ofast") 
#pragma GCC optimize("unroll-loops") 
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma") 
#include <bits/stdc++.h>
using namespace std;

constexpr int maxn = 16, mod = 998244353; // subtasks 1-2

int ans;

int edge[11][maxn][maxn];

int value_triad[11][maxn][maxn][maxn];

int id(char c) { return c-'a'; } // subtaks 1-2

set<string> mark;

void add(int& a, int b) { a += b; if(a >= mod) a -= mod; }

int D[11][maxn][maxn][maxn];

int main() {
    int n; cin >> n;
    string s;
    for(int i = 0; i < n; i++) {
        cin >> s;
        for(int rep = 0; rep < 2; rep++, reverse(s.begin(), s.end())) if(!mark.count(s)) {
            edge[s.size()][id(s[0])][id(s.back())]++;
            mark.insert(s);
        }
    }


    for(int sz = 3; sz <= 10; sz++)
        for(int a = 0; a < maxn; a++) for(int b = 0; b < maxn; b++) for(int c = 0; c < maxn; c++)
            for(int x = 0; x < maxn; x++)
                add(D[sz][a][b][c], 1ll * edge[sz][x][a] * edge[sz][x][b] % mod * edge[sz][x][c] % mod);

    for(int sz = 3; sz <= 10; sz++) {
        for(int a = 0; a < maxn; a++) for(int b = 0; b < maxn; b++) for(int c = 0; c < maxn; c++) for(int d = 0; d < maxn; d++)
        add(ans, 1ll * D[sz][a][b][c] * D[sz][a][b][d] % mod * D[sz][a][c][d] % mod * D[sz][b][c][d] % mod);
    }

    printf("%d\n", ans);
}
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