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Submission #999015

# Submission time Handle Problem Language Result Execution time Memory
999015 2024-06-15T05:02:42 Z vjudge1 Trener (COCI20_trener) C++17
110 / 110
 747 ms 16700 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

const ll N = 55, K = 1505;
const ll base = 727, mod = 1e9 + 7;

ll n, k;
map<string, ll> cnt[N], dp[N];

int main(){
    cin >> n >> k;
    for (ll i = 1; i <= n; i ++){
        for (ll j = 1; j <= k; j ++){
            string s;
            cin >> s;

            cnt[i][s]++;
            dp[i][s]++;
        }
    }

    // cout << endl;
    // for (int i = 1; i <= n; i ++){
    //     cout << i << " : ";
    //     for (auto [H, val] : dp[i])
    //         cout << H << " -- " << val << ", ";
    //     cout << endl;
    // }
    // cout << endl;

    for (ll i = n - 1; i > 0; i --){
        for (auto [S, C] : cnt[i]){
            ll sm = 0;
            // cout << "HASH = " << H << endl;
            string pref = S + '#';
            string suff = '#' + S;
            map<string, bool> seen;
            for (int c = 'a'; c <= 'z'; c ++){
                // cout << "can have edge with " << nh << endl;
                pref[i] = suff[0] = c;

                if (!seen[pref] and dp[i + 1].find(pref) != dp[i + 1].end())
                    sm = (sm + dp[i + 1][pref]) % mod;
                seen[pref] = 1;

                if (!seen[suff] and dp[i + 1].find(suff) != dp[i + 1].end())
                    sm = (sm + dp[i + 1][suff]) % mod;
                seen[suff] = 1;
            }

            dp[i][S] = C * sm % mod;
        }
    }

    // cout << endl;
    // for (int i = 1; i <= n; i ++){
    //     cout << i << " : ";
    //     for (auto [H, val] : dp[i])
    //         cout << H << " -- " << val << ", ";
    //     cout << endl;
    // }
    // cout << endl;

    ll ans = 0;
    for (auto [S, val] : dp[1])
        ans = (ans + val) % mod;
    cout << ans << endl;
}

Subtask #1
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct

Subtask #2
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 55 ms 1536 KB Output is correct
2 Correct 50 ms 1372 KB Output is correct
3 Correct 48 ms 1368 KB Output is correct
4 Correct 3 ms 348 KB Output is correct
5 Correct 34 ms 1308 KB Output is correct
6 Correct 35 ms 1116 KB Output is correct
7 Correct 3 ms 348 KB Output is correct

Subtask #3
55.0 / 55.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 55 ms 1536 KB Output is correct
6 Correct 50 ms 1372 KB Output is correct
7 Correct 48 ms 1368 KB Output is correct
8 Correct 3 ms 348 KB Output is correct
9 Correct 34 ms 1308 KB Output is correct
10 Correct 35 ms 1116 KB Output is correct
11 Correct 3 ms 348 KB Output is correct
12 Correct 723 ms 16484 KB Output is correct
13 Correct 736 ms 16464 KB Output is correct
14 Correct 747 ms 16700 KB Output is correct
15 Correct 725 ms 16464 KB Output is correct
16 Correct 31 ms 432 KB Output is correct
17 Correct 504 ms 12544 KB Output is correct
18 Correct 488 ms 12576 KB Output is correct
19 Correct 498 ms 12500 KB Output is correct
20 Correct 518 ms 12368 KB Output is correct
21 Correct 487 ms 12376 KB Output is correct
22 Correct 34 ms 348 KB Output is correct