Submission #219354

#	Time	Username	Problem	Language	Result	Execution time	Memory
219354		Vimmer	Trener (COCI20_trener)	C++14	55 / 110	2089 ms	15992 KiB

trener

#include <bits/stdc++.h>

#define F first
#define S second
#define sz(x) ll(x.size())
#define pb push_back
#define N 75005
#define M ll(1e9 + 7)

using namespace std;

typedef long double ld;
typedef long long ll;
typedef short int si;




ll dp[51][1501];

int main()
{
    ios_base::sync_with_stdio(0); istream::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int n, k;

    cin >> n >> k;

    string s[n][k][3];

    for (register int i = 0; i < n; i++)
        for (register int j = 0; j < k; j++) {cin >> s[i][j][0]; if (i != 0) {s[i][j][1] = s[i][j][0].substr(0, i); s[i][j][2] = s[i][j][0].substr(1);} }

    for (register int i = 0; i < k; i++) dp[0][i] = 1;

    for (register int i = 0; i < n - 1; i++)
        for (register int j = 0; j < k; j++)
        {
            if (dp[i][j] == 0) continue;

            for (register int u = 0; u < k; u++) if (s[i][j][0] == s[i + 1][u][1] || s[i][j][0] == s[i + 1][u][2]) dp[i + 1][u] = (dp[i + 1][u] + dp[i][j]) % M;
        }
    ll ans = 0;

    for (register int i = 0; i < k; i++) ans = (ans + dp[n - 1][i]) % M;

    cout << ans << endl;
}

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