Submission #499883

#	Time	Username	Problem	Language	Result	Execution time	Memory
499883		Carmel_Ab1	Anagramistica (COCI21_anagramistica)	C++17	110 / 110	23 ms	33160 KiB

anagramistica

/*
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
 */
#include<bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

//using namespace __gnu_pbds;
using namespace std;

typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int>vi;
typedef vector<vector<int>>vvi;
typedef vector<ll>vl;
typedef vector<vl> vvl;
typedef pair<int,int>pi;
typedef pair<ll,ll> pl;
typedef vector<pl> vpl;
typedef vector<ld> vld;
typedef pair<ld,ld> pld;
typedef vector<pi> vpi;

//typedef tree<ll, null_type, less_equal<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
template<typename T> ostream& operator<<(ostream& os, vector<T>& a){os<<"[";for(int i=0; i<ll(a.size()); i++){os << a[i] << ((i!=ll(a.size()-1)?" ":""));}os << "]\n"; return os;}

#define all(x) x.begin(),x.end()
#define YES out("YES")
#define NO out("NO")
#define out(x){cout << x << "\n"; return;}
#define GLHF ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define print(x){for(auto ait:x) cout << ait << " "; cout << "\n";}
#define pb push_back
#define umap unordered_map

template<typename T1, typename T2> istream& operator>>(istream& is, pair<T1, T2>& p){is >> p.first >> p.second;return is;}
template<typename T1, typename T2> ostream& operator<<(ostream& os, pair<T1, T2>& p){os <<"" << p.first << " " << p.second << ""; return os;}
void usaco(string taskname){
    string fin = taskname + ".in";
    string fout = taskname + ".out";
    const char* FIN = fin.c_str();
    const char* FOUT = fout.c_str();
    freopen(FIN, "r", stdin);
    freopen(FOUT, "w", stdout);
}
template<typename T>
void read(vector<T>& v){
    int n=v.size();
    for(int i=0; i<n; i++)
        cin >> v[i];
}
template<typename T>
vector<T>UNQ(vector<T>a){
    vector<T>ans;
    for(T t:a)
        if(ans.empty() || t!=ans.back())
            ans.push_back(t);
    return ans;
}



void solve();
int main(){
    GLHF;
    int t=1;
    //cin >> t;
    while(t--)
        solve();
}
void solve() {
    int n,k;
    cin >> n >> k;
    vector<string>s(n);
    read(s);

    map<string,int>mp;
    for(int i=0; i<n; i++){
        sort(all(s[i]));
        mp[s[i]]++;
    }
    ll mod=1e9+7;

    vvl C(2001,vl(2001));
    for(int i=0 ;i<=2000; i++){
        C[i][0]=1;
        for(int j=1; j<=i; j++)
            C[i][j]=(C[i-1][j-1]+C[i-1][j])%mod;
    }

    vi a;
    for(auto x:mp)a.pb(x.second);
    n=a.size();


    vvl dp(n+1,vl(k+1));

    reverse(all(a));
    a.pb(0);
    reverse(all(a));

    dp[0][0]=1;
    for(int i=1; i<=n; i++){
        for(int c=0; c<=a[i]; c++)
            for(int j=0; j<=k; j++){
                if(j>=C[c][2])
                    dp[i][j]=(dp[i][j]+dp[i-1][j-C[c][2]]*C[a[i]][c])%mod;
            }
    }
    out(dp[n][k])
}

Compilation message (stderr)

anagramistica.cpp: In function 'void usaco(std::string)':
anagramistica.cpp:46:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |     freopen(FIN, "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~
anagramistica.cpp:47:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |     freopen(FOUT, "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~

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