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Submission #863103

# Submission time Handle Problem Language Result Execution time Memory
863103 2023-10-19T15:25:22 Z Mizo_Compiler Magneti (COCI21_magneti) C++14
20 / 110
 42 ms 4544 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef double ld;
#define pb push_back
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define F first
#define S second
const int N = 50, M = 1e9+7, L = 1e4;
int n, l;
pair<int, int> r[N];
ll fact[L+52], ncr[L+60][N+1];

ll fp(ll b, ll p) {
	ll ret = 1;
	while (p) {
		if ((p & 1))ret = (ret * b) % M;
		b = (b * b) % M;
		p >>= 1;
	}
	return ret;
}

ll nCr(int a, int b) {
	if (a < 0 || b > a)return 0;
	return ncr[a][b];
}

int main () {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cin >> n >> l;
	fact[0] = 1;
	for (ll i = 1; i <= L+50; i++) {
		fact[i] = (fact[i-1] * i) % M;
	}
	ncr[0][0] = 1;
	for (int i = 1; i <= L+51; i++) {
		for (int j = 0; j <= min(n, i); j++) {
			if (!j || j == i) {
				ncr[i][j] = 1;
				continue;
			}	
			ncr[i][j] = (ncr[i-1][j] + ncr[i-1][j-1]) % M;
		}
	}
	for (int i = 0; i < n; i++) {
		cin >> r[i].F;
		r[i].S = i;
	}
  	sort(r, r+n);
  	if (r[0] == r[n-1]) {
  	cout << (fact[n] * nCr(l - (n-1)*r[0].F + n - 1, n))%M << "\n";
      return 0;
    }
	if (n <= 10) {
		ll ans = 0;
		do {
			int len = 1;
			for (int i = 1; i < n; i++) {
				len += max(r[i].F, r[i-1].F);
			}
			ans = (ans + nCr(l - len + n, n)) % M;
		} while(next_permutation(r, r+n));
		cout << ans << "\n";
		return 0;
	}
}

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 4444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 40 ms 4444 KB Output is correct
2 Correct 1 ms 4444 KB Output is correct
3 Correct 40 ms 4444 KB Output is correct
4 Correct 1 ms 4444 KB Output is correct
5 Correct 35 ms 4544 KB Output is correct
6 Correct 1 ms 4440 KB Output is correct
7 Correct 42 ms 4444 KB Output is correct
8 Correct 34 ms 4520 KB Output is correct
9 Correct 2 ms 4440 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct

Subtask #3
0 / 30.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 4444 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 50.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 4444 KB Output isn't correct
2 Halted 0 ms 0 KB -