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Submission #238748

# Submission time Handle Problem Language Result Execution time Memory
238748 2020-06-12T15:07:34 Z Salito Trener (COCI20_trener) C++14
0 / 110
 16 ms 1536 KB 
#include<bits/stdc++.h>
using namespace std;
long long const mod = 1e9+7;

unordered_map<string,int> h;
long long dp[56][1505];
int n,k;
int main()
{
    int i,j;
    string s;

	cin>>n>>k;

	for(i=1;i<=k;i++)
    {
        cin>>s;
        dp[0][i] = 1;
        h[s] = i;
    }

    for(i=1;i<n;i++)
        for(j=1;j<=k;j++)
        {
            cin>>s;
            string l,r;
            l = s.substr(0,s.size()-1);
            r = s.substr(1,s.size()-1);
            if(h[l])
                dp[i][j]=(dp[i][j]+dp[i-1][h[l]])%mod;
            if(h[r] && l!=r)
                dp[i][j]=(dp[i][j]+dp[i-1][h[r]])%mod;

            h[s] = j;
        }

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

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

Subtask #1
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Incorrect 5 ms 384 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 33.0

# Verdict Execution time Memory Grader output
1 Incorrect 16 ms 1536 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 55.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Incorrect 5 ms 384 KB Output isn't correct
3 Halted 0 ms 0 KB -