Submission #397610

#	Time	Username	Problem	Language	Result	Execution time	Memory
397610		MrRobot_28	Anagramistica (COCI21_anagramistica)	C++17	40 / 110	25 ms	34884 KiB

anagramistica

#include<bits/stdc++.h>
using namespace std;
#define X first
#define Y second
#define int long long
#define sz(a) (int)a.size()
const int mod = 1e9 + 7;
const int N = 2e3 + 100;
int cnk[N][N];
signed main()
{
  //  ifstream cin("input1.txt.4c");
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    for(int i = 0; i < N; i++)
    {
        for(int j = 0; j < N; j++)
        {
            cnk[i][j] = 0;
        }
    }
    cnk[0][0] = 1;
    for(int i = 1; i < N; i++)
    {
        cnk[i][0] = 1;
        for(int j = 1; j < N; j++)
        {
            cnk[i][j] = cnk[i - 1][j] + cnk[i - 1][j - 1];
        }
    }
    int n, k;
    cin >> n >> k;
    map<vector <int>, int> mp;
    for(int i = 0; i < n; i++)
    {
        string s;
        cin >> s;
        vector <int> cnt(26, 0);
        for(int j = 0; j < sz(s); j++)
        {
            cnt[s[j] - 'a']++;
        }
        mp[cnt]++;
    }
    vector <int> dp(k + 1, 0);
    dp[0] = 1;
    for(auto p : mp)
    {
        int t = p.Y;
        for(int j = k; j >= 0; j--)
        {
            for(int f = t; f >= 1; f--)
            {
                int add = f * (f - 1) / 2;
             //   cout << dp[j] << " " << add << " " << cnk[t][f] << "\n";
                if(add + j <= k)
                {
                    dp[add + j] = (dp[add + j] + dp[j] * cnk[t][f]) % mod;
                }
            }
        }
     //   cout << dp[k] << "\n";
    }
    cout << dp[k];
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 30 / 30
• Subtask 3: 0 / 70