#include<bits/stdc++.h> #define fi first #define se second #define mp make_pair #define pb push_back using namespace std; typedef long long ll; typedef unsigned long long ull; typedef pair<int,int> pii; typedef pair<ll,ll> pll; template<typename T> bool chkmax(T &x,T y){return x<y?x=y,1:0;} template<typename T> bool chkmin(T &x,T y){return x>y?x=y,1:0;} const int md=1e9+7; int n,a[505],dp[505*505],cc[505*505],ndp[505*505]; void chkadd(int&x,int y){x+=y; if(x>md) x-=md;} void chksub(int&x,int y){x-=y; if(x<0) x+=md;} int main(){ scanf("%d",&n); dp[0]=1; int s=0; for(int i=1;i<=n;i++){ scanf("%d",&a[i]); for(int j=505*505-1;j>=a[i];j--) chkadd(dp[j],dp[j-a[i]]); s+=a[i]; } if((s&1)||!dp[s/2]){printf("0"); return 0;} for(int i=1;i<=n;i++){ for(int j=0;j<505*505;j++) ndp[j]=dp[j]; for(int j=0;j<505*505-a[i];j++) chksub(ndp[j+a[i]],ndp[j]); for(int j=0;j<505*505;j++){ int ns=s-a[i]+j; if(ns%2==0&&ndp[ns/2-j]) cc[j]++; } } vector<int> ans; for(int i=0;i<505*505;i++) if(cc[i]==n) ans.pb(i); printf("%d\n",ans.size()); for(int i=0;i<ans.size();i++) printf("%d ",ans[i]); return 0; }

bootfall.cpp: In function 'int main()':
bootfall.cpp:44:11: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wformat=]
   44 |  printf("%d\n",ans.size());
      |          ~^    ~~~~~~~~~~
      |           |            |
      |           int          std::vector<int>::size_type {aka long unsigned int}
      |          %ld
bootfall.cpp:45:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |  for(int i=0;i<ans.size();i++) printf("%d ",ans[i]);
      |              ~^~~~~~~~~~~
bootfall.cpp:25:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   25 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
bootfall.cpp:29:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   29 |   scanf("%d",&a[i]);
      |   ~~~~~^~~~~~~~~~~~