Submission #597149

#	Time	Username	Problem	Language	Result	Execution time	Memory
597149		Valaki2	Cubeword (CEOI19_cubeword)	C++14	21 / 100	954 ms	7380 KiB

cubeword

#include <bits/stdc++.h>
using namespace std;

#define int long long
#define pb push_back
#define mp make_pair
#define pii pair<int, int>
#define fi first
#define se second

const int mod = 998244353;

const int maxn = 2e5;
const int min_l = 3;
const int max_l = 10;
const int max_ch = 6;

int combinations[max_l + 1][max_ch][max_ch];

int convert(char ch) {
    if(ch >= 'a' && ch <= 'p') {
        return ch - 'a';
    }
    if(ch >= 'q' && ch <= 'z') {
        return ch - 'q' + 32;
    }
    if(ch >= 'A' && ch <= 'P') {
        return ch - 'A' + 16;
    }
    if(ch >= 'Q' && ch <= 'Z') {
        return ch - 'Q' + 42;
    }
    if(ch >= '0' && ch <= '9') {
        return ch - '0' + 52;
    }
}

int n;
vector<string> v;
int ans;
int len;
vector<int> corners;
vector<pii > neighbours;

int try_scenario() {
    int res = 1;
    for(pii p : neighbours) {
        int coeff = combinations[len][corners[p.fi]][corners[p.se]];
        if(coeff == 0) {
            return 0;
        }
        res = (res * coeff) % mod;
    }
    return res;
}

void backtrack(int corner_id) {
    if(corner_id == 8) {
        ans = (ans + try_scenario()) % mod;
    } else {
        for(corners[corner_id] = 0; corners[corner_id] < max_ch; corners[corner_id]++) {
            backtrack(corner_id + 1);
        }
    }
}

void solve() {
    cin >> n;
    v.assign(2 * n, "");
    for(int i = 0; i < n; i++) {
        cin >> v[i];
        v[i + n] = v[i];
        reverse(v[i + n].begin(), v[i + n].end());
    }
    sort(v.begin(), v.end());
    v.resize(unique(v.begin(), v.end()) - v.begin());
    n = (int) v.size();
    for(int i = 0; i < n; i++) {
        int cur_length = (int) v[i].size();
        int cur_first = convert(v[i].front());
        int cur_last = convert(v[i].back());
        combinations[cur_length][cur_first][cur_last]++;
    }
    for(int i = 0; i < 8; i++) {
        for(int j = i + 1; j < 8; j++) {
            if(__builtin_popcount(i ^ j) == 1) {
                neighbours.pb(mp(i, j));
            }
        }
    }
    corners.assign(8, -1);
    for(len = min_l; len <= max_l; len++) {
        backtrack(0);
    }
    cout << ans << "\n";
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
    return 0;
}

Compilation message (stderr)

cubeword.cpp: In function 'long long int convert(char)':
cubeword.cpp:36:1: warning: control reaches end of non-void function [-Wreturn-type]
   36 | }
      | ^

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