Submission #1244826

#	Time	Username	Problem	Language	Result	Execution time	Memory
1244826		CrabCNH	Zapina (COCI20_zapina)	C++20	110 / 110	110 ms	3272 KiB

zapina

#include <bits/stdc++.h>

#define task   "BriantheCrab"

#define int    long long
#define pii    pair <int, int>
#define fi     first
#define se     second
#define szf    sizeof
#define sz(s)  (int)((s).size())
#define all(v) (v).begin(), (v).end()

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

using namespace std;

template <class T> void minimize (T &t, T f) {if (t > f) t = f;}
template <class T> void maximize (T &t, T f) {if (t < f) t = f;}

const int maxN = 350 + 5;
const int inf = 1e18 + 7;
const int mod = 1e9 + 7;

int n;
int dp[maxN][maxN], C[maxN][maxN];
int pw[maxN][maxN];

void solve () {
    cin >> n;
    for (int i = 0; i <= n; i ++) {
		C[i][0] = 1;
		if (i <= n) { 
		    C[i][i] = 1; 
		}
	}
	for (int i = 0; i <= n; i ++) {
		for (int j = 1; j <= min (i, n); j ++) {
			if (i != j) {
				C[i][j] = (C[i - 1][j - 1] + C[i - 1][j]) % mod;
			}    
		}
	}
	for (int base = 0; base <= n; base ++) {
        pw[base][0] = 1;
        for (int exp = 1; exp <= n; exp ++) {
            pw[base][exp] = (pw[base][exp - 1] * base) % mod;
        }
    }
    for (int i = 1; i <= n; i ++) {
        for (int k = 0; k <= n; k ++) {
            if (k >= i) {
                dp[i][k] = (dp[i][k] + C[k][i] * pw[i - 1][k - i] % mod) % mod;
            }
            for (int j = 0; j <= k; j ++) {
                if (j == i) {
                    continue;
                }
                dp[i][k] = (dp[i][k] + C[k][j] * dp[i - 1][k - j]) % mod;
            }
        }
    }
    cout << dp[n][n];
    return;
}

signed main () {
    cin.tie (nullptr) -> sync_with_stdio (false);
    if (fopen (task".inp", "r")) {
        freopen (task".inp", "r", stdin);
        freopen (task".out", "w", stdout);
    }
    int t = 1;
    //cin >> t;
    while (t --) {
        solve ();
    } 
    return 0;
}
// thfv

Compilation message (stderr)

zapina.cpp: In function 'int main()':
zapina.cpp:71:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |         freopen (task".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
zapina.cpp:72:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |         freopen (task".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 33 / 33
• Subtask 3: 55 / 55