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Submission #570638

# Submission time Handle Problem Language Result Execution time Memory
570638 2022-05-30T20:21:21 Z NekoRolly Trener (COCI20_trener) C++17
110 / 110
 240 ms 18436 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 2e3+4;
const int mod = 1e9+7;

map<string,int> cnt,dp;
int n,k,ans;

int P(int a,int b){ return 1ll*a*b%mod;}

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

	cin >> n >> k;

	for (int i=1; i<=n; i++) for (int j=0; j<k; j++){
		string s,t1,t2; cin >> s;
		if (i == 1) dp[s] = 1;
		else if (!dp.count(s)){ t1 = s.substr(0, i-1), t2 = s.substr(1, i-1);
			if (dp.count(t1)) dp[s] = (dp[s] + P(dp[t1], cnt[t1]))%mod;
			if (t1 != t2 && dp.count(t2)) dp[s] = (dp[s] + P(dp[t2], cnt[t2]))%mod;
		}
		cnt[s]++;
		if (i == n) ans = (ans + dp[s])%mod;
	}

	cout << ans << "\n";

    return 0;
}

Subtask #1
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct

Subtask #2
33.0 / 33.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 1364 KB Output is correct
2 Correct 10 ms 1480 KB Output is correct
3 Correct 11 ms 1492 KB Output is correct
4 Correct 2 ms 340 KB Output is correct
5 Correct 10 ms 1236 KB Output is correct
6 Correct 9 ms 1236 KB Output is correct
7 Correct 2 ms 464 KB Output is correct

Subtask #3
55.0 / 55.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 10 ms 1364 KB Output is correct
6 Correct 10 ms 1480 KB Output is correct
7 Correct 11 ms 1492 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 10 ms 1236 KB Output is correct
10 Correct 9 ms 1236 KB Output is correct
11 Correct 2 ms 464 KB Output is correct
12 Correct 240 ms 18436 KB Output is correct
13 Correct 220 ms 18280 KB Output is correct
14 Correct 215 ms 18064 KB Output is correct
15 Correct 231 ms 18124 KB Output is correct
16 Correct 16 ms 2216 KB Output is correct
17 Correct 178 ms 14064 KB Output is correct
18 Correct 189 ms 14212 KB Output is correct
19 Correct 188 ms 14128 KB Output is correct
20 Correct 185 ms 14140 KB Output is correct
21 Correct 183 ms 14452 KB Output is correct
22 Correct 17 ms 2224 KB Output is correct