oj.uz

답안 #845267

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
845267 2023-09-06T12:54:37 Z vjudge1 Trener (COCI20_trener) C++17
55 / 110
 126 ms 2640 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long
const int N = 2e5 + 5, MOD = 1e9 + 7, p = 29;

ll dp[55][1505], h[55][1505][3], us[60];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    us[0] = 1;

    for(int i = 1; i < 60; i++)
    {
        us[i] = (us[i - 1] * p) % MOD;
    }

    int n, k;
    cin >> n >> k;

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

            str = "#" + str;

            for(int l = 1; l <= i; l++)
            {
                h[i][j][0] = (h[i][j][0] + (str[l] - 'a' + 1) * us[l]) % MOD;
                if(l == i - 1)
                    h[i][j][1] = h[i][j][0];
            }

            for(int l = 2; l <= i; l++)
            {
                h[i][j][2] = (h[i][j][2] + (str[l] - 'a' + 1) * us[l - 1]) % MOD;
            }

     //       cout << i << " " << j << " " << h[i][j][0] << " " << h[i][j][1] << " " << h[i][j][2] << '\n';
        }
    }

    for(int i = 1; i <= k; i++)
        dp[1][i] = 1;

    for(int i = 1; i < n; i++)
    {
        for(int j = 1; j <= k; j++)
        {
            for(int l = 1; l <= k; l++)
            {
                if(h[i][j][0] == h[i + 1][l][1])
                {
                    if(dp[i + 1][l] == 0)
                    {
                        dp[i + 1][l] = dp[i][j];
                    }
                    else
                    {
                        dp[i + 1][l] = (dp[i + 1][l] + dp[i][j]) % MOD;
                    }
                }
                else if(h[i][j][0] == h[i + 1][l][2])
                {
                    if(dp[i + 1][l] == 0)
                    {
                        dp[i + 1][l] = dp[i][j];
                    }
                    else
                    {
                        dp[i + 1][l] = (dp[i + 1][l] + dp[i][j]) % MOD;
                    }
                }
            }
        }
    }

    // for(int i = 1; i <= n; i++)
    // {
    //     for(int j = 1; j <= k; j++)
    //     {
    //         cout << dp[i][j] << " " ;
    //     }
    //     cout << '\n';
    // }

    ll ans = 0;

    for(int i = 1; i <= k; i++)
        ans = (ans + dp[n][i]) % MOD;

    cout << ans << '\n';
}

Subtask #1
22.0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 344 KB Output is correct

Subtask #2
33.0 / 33.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 856 KB Output is correct
2 Correct 3 ms 860 KB Output is correct
3 Correct 2 ms 860 KB Output is correct
4 Correct 3 ms 856 KB Output is correct
5 Correct 3 ms 856 KB Output is correct
6 Correct 3 ms 856 KB Output is correct
7 Correct 3 ms 860 KB Output is correct

Subtask #3
0 / 55.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 4 ms 856 KB Output is correct
6 Correct 3 ms 860 KB Output is correct
7 Correct 2 ms 860 KB Output is correct
8 Correct 3 ms 856 KB Output is correct
9 Correct 3 ms 856 KB Output is correct
10 Correct 3 ms 856 KB Output is correct
11 Correct 3 ms 860 KB Output is correct
12 Correct 126 ms 2628 KB Output is correct
13 Correct 125 ms 2640 KB Output is correct
14 Incorrect 125 ms 2640 KB Output isn't correct
15 Halted 0 ms 0 KB -