AcWing 3733. 去掉一个元素

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#include <iostream>
using namespace std;
const int N = 100;
int n;
int a[N];
int main() {
    cin >> n;
    int p = 0, o = 0;
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
        if (a[i] & 1) ++o;
        else ++p;
    }
    cout << (o & 1 ? o : p) << endl;
    return 0;
}