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
35
36
37
38
39
40
41
42
43
44
45
#include <vector>
#include <cstdio>

const unsigned pvalue = 1e9 + 7;

inline bool is_mopadulo(unsigned long long v) {
    return (v % pvalue) % 2 == 0;
}

int main() {

    int n;
    scanf("%d", &n);

    std::vector<int> tab(n, 0);
    for (int i = 0; i < n; ++i)
        scanf("%d", &tab[i]);

    std::vector<unsigned> mem(n+1, 0);
    unsigned long long sum = 0;
    for (size_t i = 0; i < n; ++i)
    {
        unsigned long long v = 0;
        sum += tab[i];
        
        if (is_mopadulo(sum))
            v = 1;

        unsigned long long sumt = sum;
        for (size_t j = 0; j < i; ++j) 
        {
            sumt -= tab[j];
            if (is_mopadulo(sumt)) {
                v += mem[j];
                v %= pvalue;
            }
        }

        mem[i] = v;
    }

    printf("%u\n", mem[n-1]);

    return 0;
}