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답안 #680020

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
680020 2023-01-09T19:15:54 Z Shadii_usf Anagramistica (COCI21_anagramistica) C++14
110 / 110
 29 ms 32040 KB 
#include <bits/stdc++.h>
using namespace std;
const int maxn = 2e3 + 10, mod = 1e9 + 7;
long long  dp[maxn][maxn] , f[maxn] , invf[maxn]  , anss;
long long power(int a , int b){
    if(b == 0){
        return 1;
    }
    anss = power(a , b/2);
    anss *= anss;
    anss %= mod;
    if(b & 1){
        anss *= a;
        anss %= mod;
    }
    return anss;
}
long long c(int n , int k){
    if(k > n){
        return 0;
    }
    return (((f[n] * invf[k]) % mod) * invf[n - k]) % mod;
}
int main(){
    long long n , k , cnt = 0 , sizee;
    string a[maxn];
    bool mark[maxn] , markk[maxn];
    vector <int> v;
    cin >> n >> k;
    for(int i=1 ; i<=n ; i++){
        cin >> a[i];
        sort(a[i].begin() , a[i].end());
    }
    for(int i=0 ; i<maxn ; i++){
        mark[i] = 0;
        for(int j=0 ; j<maxn ; j++){
            dp[i][j] = 0;
        }
    }
    for(int i=1 ; i<=n ; i++){
        if(!mark[i]){
            for(int j = 1 ; j<=n ; j++){
                if(a[i] == a[j] && !mark[j]){
                    mark[j] = true;
                    cnt++;
                }
            }
            v.push_back(cnt);
            cnt = 0;
        }
    }
    f[0] = invf[0] = 1;
    for(int i=1 ; i<maxn ; i++){
        f[i] = f[i-1] * i;
        f[i] %= mod;
        invf[i] = power(f[i] , mod - 2);
    }
    sizee = v.size();
    dp[0][0] = 1;
    for(int i=1 ; i<=sizee ; i++){
        for(int j=0 ; j<=k ; j++){
            for(int m = 0 ; m <= v[i - 1] ; m++){
                if(c(m , 2) <= j){
                    dp[i][j] = (dp[i][j] + ((dp[i - 1][j - c(m , 2)] * c(v[i-1] , m)) % mod)) % mod;
                    dp[i][j] %= mod;
                }
            }
        }
    }
    sizee = v.size();
    cout << dp[sizee][k];
}

Compilation message

anagramistica.cpp: In function 'int main()':
anagramistica.cpp:27:23: warning: unused variable 'markk' [-Wunused-variable]
   27 |     bool mark[maxn] , markk[maxn];
      |                       ^~~~~

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 31956 KB Output is correct
2 Correct 12 ms 32000 KB Output is correct
3 Correct 14 ms 31968 KB Output is correct
4 Correct 13 ms 31964 KB Output is correct
5 Correct 13 ms 32016 KB Output is correct

Subtask #2
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 31992 KB Output is correct
2 Correct 15 ms 32024 KB Output is correct
3 Correct 14 ms 31956 KB Output is correct
4 Correct 19 ms 32012 KB Output is correct

Subtask #3
70.0 / 70.0

# 결과 실행 시간 메모리 Grader output
1 Correct 13 ms 31956 KB Output is correct
2 Correct 12 ms 32000 KB Output is correct
3 Correct 14 ms 31968 KB Output is correct
4 Correct 13 ms 31964 KB Output is correct
5 Correct 13 ms 32016 KB Output is correct
6 Correct 13 ms 31992 KB Output is correct
7 Correct 15 ms 32024 KB Output is correct
8 Correct 14 ms 31956 KB Output is correct
9 Correct 19 ms 32012 KB Output is correct
10 Correct 15 ms 31972 KB Output is correct
11 Correct 14 ms 31956 KB Output is correct
12 Correct 13 ms 31992 KB Output is correct
13 Correct 15 ms 32020 KB Output is correct
14 Correct 16 ms 31968 KB Output is correct
15 Correct 15 ms 31956 KB Output is correct
16 Correct 29 ms 32040 KB Output is correct
17 Correct 24 ms 31940 KB Output is correct
18 Correct 16 ms 32004 KB Output is correct