Submission #1086991

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086991		underwaterkillerwhale	Trener (COCI20_trener)	C++17	110 / 110	159 ms	18572 KiB

trener

#include <bits/stdc++.h>
#define ll              long long
#define pii             pair<int,int>
#define pll             pair<ll,ll>
#define rep(i,m,n)      for(int i=(m); i<=(n); i++)
#define reb(i,m,n)      for(int i=(m); i>=(n); i--)
#define iter(id, v)     for(auto id : v)
#define fs              first
#define se              second
#define MP              make_pair
#define pb              push_back
#define bit(msk, i)     ((msk >> i) & 1)
#define SZ(v)           (ll)v.size()
#define ALL(v)          v.begin(),v.end()

using namespace std;

mt19937_64 rd(chrono :: steady_clock :: now ().time_since_epoch().count());
ll Rand (ll l, ll r) { return uniform_int_distribution<ll> (l, r) (rd); }

const int N = 50 + 7;
const int M = 2e3 + 7;
const int Mod = 1e9 + 7;
const int INF = 1e9;
const ll BASE = 137;
const int szBL = 350;

int n, K;
string a[M];
map<string, int> pdp, dp;

void solution() {
    cin >> n >> K;
    rep (i, 1, n) {
        rep (j, 1, K) cin >> a[j];
        rep (j, 1, K) {
            string &s = a[j];
            if (i == 1) dp[s]++;
            else {
                string s1, s2;
                s1 = s.substr(1, SZ(s) - 1);
                s2 = s.substr(0, SZ(s) - 1);
                if (s1 != s2) dp[s] = ((dp[s] + pdp[s1]) % Mod + pdp[s2]) % Mod;
                else dp[s] = (dp[s] + pdp[s1]) % Mod;
            }
        }
        rep (j, 1, K) {
            pdp[a[j]] = dp[a[j]];
//            cout << a[j] <<": "<<pdp[a[j]] <<"\n";
        }
        dp.clear();
    }
    sort (a + 1, a + 1 + K);
    K = unique(a + 1, a + 1 + K) - a - 1;
    int res = 0;
    rep (i, 1, K) res = (res + pdp[a[i]]) % Mod;
    cout << res <<"\n";

}

#define file(name) freopen(name".inp","r",stdin); \
freopen(name".out","w",stdout);
int main () {
//    file("c");
    ios_base :: sync_with_stdio(false); cin.tie(0); cout.tie(0);
    int num_Test = 1;
//    cin >> num_Test;
    while (num_Test--)
        solution();
}
/*
no bug +7
5 3 1
1 1 1 2 3
2 3 5
1 2
2 3
2 4
1 5
2 3
*/

• Subtask 1: 22 / 22
• Subtask 2: 33 / 33
• Subtask 3: 55 / 55