Submission #373213

#	Time	Username	Problem	Language	Result	Execution time	Memory
373213		ACmachine	Cubeword (CEOI19_cubeword)	C++17	84 / 100	948 ms	19124 KiB

cubeword

#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;
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx,avx2,fma")
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 mod = 998244353;
int main(){
 	ios_base::sync_with_stdio(false);
 	cin.tie(NULL); cout.tie(NULL);
 	const int alpha = 52;
    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));
    ll D[alpha][alpha][alpha];
    ll cn[alpha][alpha];
    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[f][s]++;
            xprev = x;
        }
        REP(i, alpha){
            REP(j, alpha){
                REP(k, alpha){
                    REP(g, alpha){
                        D[j][k][g] += (cn[i][j] * cn[i][k] * cn[i][g]) % mod;
                        D[j][k][g] %= mod;
                    }
                }
            }
        }
        ll res = 0;
        REP(a, alpha){
            REP(b, alpha){
                REP(c, alpha){
                    REP(d, alpha){
                        res += (((((D[a][d][c] * D[a][d][b]) % mod) * D[a][c][b]) % mod) * D[d][c][b]) % mod;
                        res %= mod;
                    }
                }
            }
        }
        return res;
    };
    vector<vector<string>> todo(11);
    REP(i, strings.size()) todo[strings[i].length()].pb(strings[i]);
    ll ans = 0;
    FOR(i, 3, 11, 1){
        if(todo[i].size() > 0)
            ans += solve(todo[i]);
        ans %= mod;
    }
    cout << ans << "\n";
    return 0;
}

Compilation message (stderr)

cubeword.cpp: In lambda function:
cubeword.cpp:83:13: warning: unused variable 'nn' [-Wunused-variable]
   83 |         int nn = a.size();
      |             ^~
cubeword.cpp: In function 'int main()':
cubeword.cpp:20:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 | #define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
      |                                        ^
cubeword.cpp:22:18: note: in expansion of macro 'FOR'
   22 | #define REP(i,b) FOR(i,0,b,1)
      |                  ^~~
cubeword.cpp:117:5: note: in expansion of macro 'REP'
  117 |     REP(i, strings.size()) todo[strings[i].length()].pb(strings[i]);
      |     ^~~

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