oj.uz

Submission #421082

# Submission time Handle Problem Language Result Execution time Memory
421082 2021-06-08T17:24:07 Z Chaska Anagramistica (COCI21_anagramistica) C++11
10 / 110
 10 ms 13260 KB 
#include <bits/stdc++.h>
using namespace std;
const int N = 2e3+5,mod = 1e9+7;
typedef long long ll;
int n,k;
string a[N];
set<string> s;
map<string,int> sTOi;
int cnt,res[N];
int cb[N][N],dp[N][N];
int main()
{
    cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
    cin >> n >> k;
    for (int i=0;i<n;i++) 
        cin >> a[i];

    for (int i=0;i<n;i++) 
        sort(a[i].begin(),a[i].end());

    for (int i=0;i<n;i++) s.insert(a[i]);

    for (string u : s) sTOi[u] = ++cnt;


    for (int i=0;i<n;i++) res[sTOi[a[i]]]++;
    

    cb[0][0] = 1;
    for (int i=1;i<=n;i++)  for (int j=0;j<=i;j++) {
        if (j==0) cb[i][j] = 1;
        else {
            cb[i][j] = cb[i-1][j-1] + cb[i-1][j];
            cb[i][j] %= mod;
        }
    }

    dp[0][0] = 1;
    for (int i=1;i<=n;i++) for (int q=0;q<=k;q++) {
        for (int j=0;j<=res[i];j++) {
            ll x = j*(j-1);
            x/= 2;
            ll y;
            y = cb[res[i]][j];
            y %= mod;
           
            if (q>=x) {
                dp[i][q] = dp[i][q] + y*dp[i-1][q-x];
                dp[i][q] %= mod;
            }
        }
       
    }
    cout << dp[n][k];
    return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 460 KB Output is correct
2 Correct 1 ms 460 KB Output is correct
3 Correct 1 ms 460 KB Output is correct
4 Correct 1 ms 460 KB Output is correct
5 Correct 1 ms 460 KB Output is correct

Subtask #2
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 10 ms 13260 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 460 KB Output is correct
2 Correct 1 ms 460 KB Output is correct
3 Correct 1 ms 460 KB Output is correct
4 Correct 1 ms 460 KB Output is correct
5 Correct 1 ms 460 KB Output is correct
6 Incorrect 10 ms 13260 KB Output isn't correct
7 Halted 0 ms 0 KB -