Submission #1266421

#	Time	Username	Problem	Language	Result	Execution time	Memory
1266421		CodeLakVN	Anagramistica (COCI21_anagramistica)	C++20	110 / 110	21 ms	30024 KiB

anagramistica

#include <bits/stdc++.h>
using namespace std;

#define task "main"
#define F first
#define S second
#define ii pair<int, int>
#define il pair<int, long long>
#define li pair<long long, int>
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FOD(i, b, a) for(int i = (b); i >= (a); --i)

template <class T1, class T2>
    bool maximize(T1 &a, T2 b){
        if (a < b) {a = b; return true;}
        return false;
    }

template <class T1, class T2>
    bool minimize(T1 &a, T2 b){
        if (a > b) {a = b; return true;}
        return false;
    }

template <class T>
    void printArr(T container, string separator = " ", string finish = "\n", ostream &out = cout){
        for(auto item: container) out << item << separator;
        out << finish;
    }

const int MAX_N = (int)2e3 + 3;
const int MOD = (int)1e9 + 7;
const int base = 311;

int n, k;
string s[MAX_N];

int cnt[27];
int hsh[MAX_N];

int a[MAX_N];

int C[MAX_N][MAX_N];
int dp[MAX_N][MAX_N];

void add(int &x, int y) {
    x += y;
    if (x >= MOD) x -= MOD;
}

void solve() {
    cin >> n >> k;
    FOR(i, 1, n) cin >> s[i];

    FOR(i, 1, n) {
        FOR(c, 1, 26) cnt[c] = 0;
        for (int c : s[i]) cnt[c - 'a' + 1]++;
        hsh[i] = 0;
        FOR(c, 1, 26) hsh[i] = (1LL * hsh[i] * base % MOD + cnt[c]) % MOD;
    }
    sort(hsh + 1, hsh + n + 1);
    int i = 1, m = 0;
    while (i <= n) {
        int j = i;
        while (j <= n && hsh[j] == hsh[i]) j++;
        a[++m] = (j - i);
        i = j;
    }

    FOR(i, 0, n) C[0][i] = 1;
    FOR(i, 1, n) FOR(j, 1, i)
        C[j][i] = (1LL * C[j][i - 1] + C[j - 1][i - 1]) % MOD;

    memset(dp, 0, sizeof(dp));
    dp[0][0] = 1;
    FOR(i, 1, m) FOR(j, 0, k) {
        int x = 0;
        while (x <= a[i] && x * (x - 1) / 2 <= j) {
            add(dp[i][j], 1LL * dp[i - 1][j - x * (x - 1) / 2] * C[x][a[i]] % MOD);
            x++;
        }
    }

    cout << dp[m][k];
}

int32_t main() {
    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    bool multitest = 0;
    int numTest = 1;
    if (multitest) cin >> numTest;

    while (numTest--) {
        solve();
    }

    return 0;
}

/* Lak lu theo dieu nhac!!!! */

Compilation message (stderr)

anagramistica.cpp: In function 'int32_t main()':
anagramistica.cpp:89:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   89 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
anagramistica.cpp:90:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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