제출 #439640

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
439640		prvocislo	Cubeword (CEOI19_cubeword)	C++17	100 / 100	499 ms	17664 KiB

cubeword

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

const int mod = 998244353, abc = 62;
void upd(int &a, const int &b) { 
    a += b;
    if (a >= mod) a -= mod;
}
int mul(const int &a, const int &b) { return (a * 1ll * b) % (ll)mod; }
//                  000 001 010 011 100 101 110 111
const int per[8] = { 24, 12, 12,  4, 12,  6,  4,  1 };
int conv(char c)
{
    if ('a' <= c && c <= 'z') return c - 'a';
    if ('A' <= c && c <= 'Z') return 26 + c - 'A';
    if ('0' <= c && c <= '9') return 26 + 26 + c - '0';
}
int cnt[abc][abc][abc], e[abc][abc], ans = 0;
void solve(const set<string> &v)
{
    memset(cnt, 0, sizeof(cnt)), memset(e, 0, sizeof(e));
    for (const string &i : v) e[conv(i[0])][conv(i.back())]++;
    for (int c1 = 0; c1 < abc; c1++) for (int c2 = c1; c2 < abc; c2++) for (int c3 = c2; c3 < abc; c3++)
        for (int ja = 0; ja < abc; ja++)
            upd(cnt[c1][c2][c3], (e[ja][c1] * 1ll * e[ja][c2] * 1ll * e[ja][c3]) % mod);
    for (int c1 = 0; c1 < abc; c1++) for (int c2 = 0; c2 < abc; c2++) for (int c3 = 0; c3 < abc; c3++)
    {
        vector<int> c = {c1, c2, c3}; sort(c.begin(), c.end());
        cnt[c1][c2][c3] = cnt[c[0]][c[1]][c[2]];
    }
    for (int c1 = 0; c1 < abc; c1++) for (int c2 = c1; c2 < abc; c2++) for (int c3 = c2; c3 < abc; c3++) for (int c4 = c3; c4 < abc; c4++)
    {
        int pr = mul(mul(cnt[c1][c2][c3], cnt[c2][c3][c4]), mul(cnt[c3][c4][c1], cnt[c4][c1][c2]));
        int msk = (c1 == c2) | ((c2 == c3) << 1) | ((c3 == c4) << 2);
        upd(ans, mul(pr, per[msk]));
    } 
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    vector<set<string> > v(11);
    for (int i = 0; i < n; i++)
    {
        string s; cin >> s;
        v[s.size()].insert(s);
        reverse(s.begin(), s.end());
        v[s.size()].insert(s);
    }
    for (int i = 3; i <= 10; i++) if (v[i].size()) solve(v[i]);
    cout << ans << "\n";
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

cubeword.cpp: In function 'int conv(char)':
cubeword.cpp:18:1: warning: control reaches end of non-void function [-Wreturn-type]
   18 | }
      | ^

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