1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
#include <bits/stdc++.h>
using namespace std;

const long long MOD = 1000000007;
long long wynik;

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	long long n;
	cin >> n;
	long long a[n+1];
	a[0] = 0;
	for(int i = 1; i <= n; i++){
		cin >> a[i];
	}
	long long px[n+1];
	px[0] = 0;
	for(int i = 1; i <= n; i++){
		px[i] = px[i-1] + a[i];
	}
	long long dp[n+1];
	dp[0] = 0;
	for(long long i = 1; i <= n; i++){
		if((px[i]%MOD)&1) dp[i] = 0;
		else dp[i] = 1;
		for(long long j = i; j > 0; j--){
			if(((px[i] - px[j-1])%MOD)%2 == 0) dp[i] = (dp[j-1]+dp[i])%MOD;
		}
	}
	cout << dp[n]%MOD;
	return 0;
}