Submission #376509

#	Time	Username	Problem	Language	Result	Execution time	Memory
376509		kostia244	Cubeword (CEOI19_cubeword)	C++17	0 / 100	649 ms	17332 KiB

cubeword

#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,avx,avx2")
#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using ordered_map = tree<T, U, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
typedef long long ll;
typedef long double ld;
 
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
 
typedef vector<int> vi;
typedef vector<ll> vll;
 
#define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
#define FORD(i,j,k,in) for(int i=(j); i >=(k);i-=in)
#define REP(i,b) FOR(i,0,b,1)
#define REPD(i,b) FORD(i,b,0,1)
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define all(x) begin(x), end(x)
#define MANY_TESTS int tcase; cin >> tcase; while(tcase--)
 
const double EPS = 1e-9;
const int MOD = 1e9+7;
const ll INFF = 1e18;
const int INF = 1e9;
const ld PI = acos((ld)-1);
const vi dy = {1, 0, -1, 0, -1, 1, 1, -1};
const vi dx = {0, 1, 0, -1, -1, 1, -1, 1};
 
void DBG(){cout << "]" << endl;}
template<typename T, typename ...U> void DBG(const T& head, const U... args){ cout << head << "; "; DBG(args...); }
#define dbg(...) cout << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__);
#define chk() cout << "Check at line(" << __LINE__ << ") hit." << endl;
 
template<class T, unsigned int U>
ostream& operator<<(ostream& out, const array<T, U> &v){out << "[";  REP(i, U) out << v[i] << ", ";  out << "]"; return out;}
template <class T, class U>
ostream& operator<<(ostream& out, const pair<T, U> &par) {out << "[" << par.first << ";" << par.second << "]"; return out;}
template <class T>
ostream& operator<<(ostream& out, const set<T> &cont) { out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template <class T, class U>
ostream& operator<<(ostream& out, const map<T, U> &cont) {out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template<class T>
ostream& operator<<(ostream& out, const vector<T> &v){ out << "[";  REP(i, v.size()) out << v[i] << ", ";  out << "]"; return out;}
 
template<class T>
istream& operator>>(istream& in, vector<T> &v){ for(auto &x : v) in >> x; return in; }
 
const int alpha = 52;
const int mod = 998244353;

uint D[11][alpha][alpha][alpha];
uint D_q[11][alpha][alpha][alpha];
uint cn[11][alpha][alpha];
uint cn_q[11][alpha][alpha];

inline __attribute__(( always_inline )) uint multiply(const uint &a, const uint &b, const uint &a_inv) {
	uint Q = (a_inv*1ll*b)>>32;
	return a*b - Q*mod;
}

int main(){
 	ios_base::sync_with_stdio(false);
 	cin.tie(NULL); cout.tie(NULL);
    vector<int> cnv(150);
    REP(i, 26) cnv['a' + i] = i;
    REP(i, 26) {
        cnv['A' + i] = 26 + i;
    }
    REP(i, 10){
        cnv['0' + i] = 52 + i;
    }
    int n; cin >> n;
    vector<string> strings(n);
    cin >> strings;
    REP(i, n){
        string ns = strings[i];
        reverse(all(ns));
        strings.pb(ns);
    }
    sort(all(strings));
    auto solve = [&](vector<string> &a){
        int nn = a.size();
        memset(D, 0, sizeof(D));
        memset(cn, 0, sizeof(cn));
        string xprev = "";
        for(string x : a){
            if(x == xprev) continue;
            int f = cnv[x[0]]; int s = cnv[x.back()];
            cn[x.length()][f][s]++;
            xprev = x;
        }
        FOR(len, 3, 11, 1)
            REP(i, alpha)
                REP(j, alpha) {
						cn_q[len][i][j] = (uint64_t(cn[len][i][j])<<32)/mod;
					}
        FOR(len, 3, 11, 1){
            REP(i, alpha){
                REP(j, alpha){
                    REP(k, alpha){
                        REP(g, alpha){
							uint res = multiply(cn[len][i][j], cn[len][i][k], cn_q[len][i][j]);
							res = multiply(cn[len][i][g], res, cn_q[len][i][g]);
                            D[len][j][k][g] += res;
                            if(D[len][j][k][g] >= 2*mod) D[len][j][k][g] -= 2*mod;
                        }
                    }
                }
            }
        }
        FOR(len, 3, 11, 1)
            REP(a, alpha)
                REP(b, alpha)
                    REP(c, alpha){
						D_q[len][a][b][c] = (uint64_t(D[len][a][b][c])<<32)/mod;
					}
        ll res = 0;
        FOR(len, 3, 11, 1){
            REP(a, alpha){
                REP(b, alpha){
                    REP(c, alpha){
                        REP(d, alpha){
							uint x = multiply(D[len][a][d][c], D[len][a][d][b], D_q[len][a][d][c]);
							x = multiply(D[len][a][c][b], x, D_q[len][a][c][b]);
							x = multiply(D[len][d][c][b], x, D_q[len][d][c][b]);
                            res += x;
                            if(res >= 2*mod) res -= 2*mod;
                        }
                    }
                }
            }
        }
        res %= mod;
        return res;
    };
    ll ans = solve(strings);
    cout << ans << "\n";
    return 0;
}

Compilation message (stderr)

cubeword.cpp: In lambda function:
cubeword.cpp:93:13: warning: unused variable 'nn' [-Wunused-variable]
   93 |         int nn = a.size();
      |             ^~

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