This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define ll long long
using namespace std;
#define f first
#define s second
#define pb push_back
#define ep emplace
#define eb emplace_back
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define uniquev(v) sort(all(v)), (v).resize(unique(all(v)) - (v).begin())
#define mem(f,x) memset(f , x , sizeof(f))
#define sz(x) (int)(x).size()
#define __lcm(a, b) (1ll * ((a) / __gcd((a), (b))) * (b))
#define mxx *max_element
#define mnn *min_element
#define cntbit(x) __builtin_popcountll(x)
#define len(x) (int)(x.length())
const int N = 500 + 30;
const int M = 500 * 500 + 10;
int f[M + 10], f2[M + 10], cnt[M + 10], mod = 1e8 + 3;
int a[N];
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
f[0] = 1;
ll sum = 0;
int n;
cin >> n;
for (int i = 1; i <= n; i++) {
cin >> a[i];
sum += a[i];
for (int j = M; j >= a[i]; j--) {
f[j] = (f[j] + f[j - a[i]]) % mod;
}
}
if (sum % 2 == 0) {
if (f[sum / 2] == 0) {
cout << 0 << '\n';
return 0;
}
}
for (int i = 1; i <= n; i++) {
for (int j = 0; j <= M; j++) {
if (j >= a[i]) {
f2[j] = (f[j] - f2[j - a[i]]);
while (f2[j] < 0)
f2[j] += mod;
} else {
f2[j] = f[j];
}
}
int odd = (sum - a[i]) % 2;
for (int j = odd; j <= M; j += 2) {
int all = sum - a[i] + j;
if (all % 2 == 0) {
int h = all / 2;
if (f2[h] || (h >= j && f2[h - j])) {
cnt[j]++;
}
}
}
}
vector <int> save;
for (int i = 1; i <= M; i++)
if (cnt[i] == n)
save.pb(i);
cout << sz(save) << '\n';
for (auto x : save)
cout << x << " ";
return 0;
}
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