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 int long long
#define endl '\n'
using namespace std;
signed main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int n;
cin>>n;
int arr[n];
for(auto &i:arr)cin>>i;
vector<bool>v(500*n+1);
v[0]=1;
int sm=0;
for(int i=0;i<n;i++){
sm+=arr[i];
for(int w=500*n;w>=0;w--){
if(v[w])v[w+arr[i]]=1;
}
}
if(sm%2!=0||!v[sm/2]){cout<<0;return 0;}
sm++;
vector<int>ans(sm);
for(int i=0;i<n;i++){
vector<bool>vec(sm);
vec[0]=1;
int smm=0;
for(int w=0;w<n;w++){
if(w==i)continue;
smm+=arr[w];
for(int j=sm;j>=0;j--){
if(vec[j])vec[j+arr[w]]=1;
}
}
set<int>st;
for(int w=0;w<=sm;w++){
if(vec[w])st.insert(abs(smm-w-w));
}
for(auto &w:st)ans[w]++;
}
int cnt=0;
for(auto &i:ans){
if(i==n)cnt++;
}
cout<<cnt<<endl;
for(int i=1;i<=sm;i++){
if(ans[i]==n)cout<<i<<' ';
}
}
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