Submission #557873

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
557873	2022-05-06T08:11:07 Z	FatihSolak	W (RMI18_w)	C++17	20 / 100	252 ms	21236 KB

w

#include <bits/stdc++.h>
#define N 300005
using namespace std;
const int mod = 1e9 + 7;
long long fact[N];
long long ifact[N];
long long binpow(long long a,long long b){
	long long ret = 1;
	while(b){
		if(b & 1)
			ret = ret*a%mod;
		a = a*a%mod;
		b >>= 1;
	}
	return ret;
}
long long C(int n,int r){
	return fact[n] * ifact[r]%mod*ifact[n-r]%mod;
}
void solve(){
	int n;
	cin >> n;
	map<int,int> cnt;
	for(int i = 1;i<=n;i++){
		int x;
		cin >> x;
		cnt[x]++;
	}
	vector<int> v;
	for(auto u:cnt)
		v.push_back(u.second);
	if(v[0] < 2 || v[1] < 3){
		cout << 0;
		return;
	}
	cout << C(v[0]-2+1,1) *C(v[1]-3+2,2) %mod;
}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	#ifdef Local
		freopen("in.txt","r",stdin);
		freopen("out.txt","w",stdout);
	#endif
	fact[0] = ifact[0]= 1;
	for(int i = 1;i<N;i++){
		fact[i] = fact[i-1] * i %mod;
		ifact[i] = binpow(fact[i],mod-2);
	}
	int t = 1;
	//cin >> t;
	while(t--){
		solve();
	}
	#ifdef Local
		cout << endl << fixed << setprecision(2) << 1000.0*clock()/CLOCKS_PER_SEC << " milliseconds.";
	#endif
}

Subtask #1

20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	44 ms	4948 KB	Output is correct
2	Correct	43 ms	4888 KB	Output is correct
3	Correct	48 ms	4940 KB	Output is correct
4	Correct	61 ms	5000 KB	Output is correct

Subtask #2

0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	44 ms	4892 KB	Output isn't correct
2	Incorrect	45 ms	4968 KB	Output isn't correct
3	Incorrect	67 ms	6568 KB	Output isn't correct
4	Incorrect	100 ms	10320 KB	Output isn't correct
5	Incorrect	153 ms	15552 KB	Output isn't correct
6	Incorrect	252 ms	21236 KB	Output isn't correct

Subtask #3

0 / 50.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	44 ms	4940 KB	Output isn't correct
2	Incorrect	44 ms	4988 KB	Output isn't correct
3	Incorrect	43 ms	4992 KB	Output isn't correct
4	Incorrect	44 ms	4944 KB	Output isn't correct
5	Incorrect	44 ms	4908 KB	Output isn't correct
6	Incorrect	44 ms	5244 KB	Output isn't correct
7	Incorrect	46 ms	5192 KB	Output isn't correct
8	Incorrect	61 ms	4996 KB	Output isn't correct
9	Incorrect	77 ms	5020 KB	Output isn't correct
10	Incorrect	240 ms	20876 KB	Output isn't correct