Submission #238357

#	Time	Username	Problem	Language	Result	Execution time	Memory
238357		danikoynov	Trener (COCI20_trener)	C++14	22 / 110	12 ms	3744 KiB

trener

#include<bits/stdc++.h>
#define endl '\n'

using namespace std;
const int MAXN = 55, MAXK = 1510;
const long long mod = 1e9 + 7;

int n, k;
long long dp[MAXN][MAXK];
string s[MAXN][MAXK];
pair < string, string > p[MAXN][MAXN];
int main()
{
    ios_base::sync_with_stdio(NULL);
    cin.tie(NULL);
    cout.tie(NULL);

    cin >> n >> k;
    for (int i = 1; i <= n; i ++)
        for (int j = 1; j <= k; j ++)
        cin >> s[i][j];

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

    for (int i = 1; i <= n; i ++)
        for (int j = 1; j <= k; j ++)
    {
        p[i][j].first = s[i][j].substr(0, s[i][j].size() - 1);
        p[i][j].second = s[i][j].substr(1, s[i][j].size() - 1);
    }
    for (int i = 1; i < n; i ++)
        for (int j = 1; j <= k; j ++)
            for (int d = 1; d <= k; d ++)
            {
                if (s[i][j] == p[i + 1][d].first || s[i][j] == p[i + 1][d].second)
                    dp[i + 1][d] = (dp[i + 1][d] + dp[i][j]) % mod;
            }

    long long ans = 0;
    for (int j = 1; j <= k; j ++)
        ans = (ans + dp[n][j]) % mod;

    cout << ans << endl;
    return 0;
}

• Subtask 1: 22 / 22
• Subtask 2: 0 / 33
• Subtask 3: 0 / 55