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  0

  rock    8:10 a.m. 25 Tháng 10, 2024

  var n,i,j,m:longint;
  d:array[0..100001] of int64;
  BEGIN
  readln(n);
  d[0]:=1;
  if n(n+1) div 2 mod 2 = 1 then write('0') else
  begin
  m:=n(n+1) div 4;
  for i:=1 to n do
  for j:=m downto i do
  d[j]:=(d[j]+d[j-i]) mod 1000000007;
  write(d[m]*1000000008 div 2 mod 1000000007);
  end;
  END.

• 
  

  -1

  An2009    10:21 p.m. 2 Tháng 8, 2024

  dành cho các bạn bí ý tưởng cần code để hiểu th nhé:

  include<bits/stdc++.h>

  using namespace std;
  template<typename... T>
  void see(T&... args) { ((cin >> args), ...);}
  template<typename... T>
  void put(T&&... args) { ((cout << args << " "), ...);}
  template<typename... T>
  void putl(T&&... args) { ((cout << args << " "), ...); cout<<'\n';}

  define error(args...)

  void err(istream_iterator<string> it) {}
  template<typename T, typename... Args>
  void err(istream_iterator<string> it, T a, Args... args) {cerr << *it << "=" << a << ", "; err(++it, args...);}

  define int long long

  define pb push_back

  define F first

  define S second

  define ll long long

  define ull unsigned long long

  define ld long double

  define pii pair<int,int>

  define vi vector<int>

  define vii vector<pii>

  define vc vector

  define L cout<<'\n';

  define E cerr<<'\n';

  define all(x) x.begin(),x.end()

  define rep(i,a,b) for (int i=a; i<b; ++i)

  define rev(i,a,b) for (int i=a; i>b; --i)

  define IOS ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);

  define setpr(x) cout<<setprecision(x)<<fixed

  define sz size()

  define seea(a,x,y) for(int i=x;i<y;i++){cin>>a[i];}

  define seev(v,n) for(int i=0;i<n;i++){int x; cin>>x; v.push_back(x);}

  define sees(s,n) for(int i=0;i<n;i++){int x; cin>>x; s.insert(x);}

  const ll inf = INT_MAX;
  const ld ep = 0.0000001;
  const ld pi = acos(-1.0);
  const ll md = 1000000007;

  int dp[500005];
  void solve(){
  int n; see(n);
  if (n%4!=0 && n%4!=3) {put(0); return;}
  vi v;
  int s = (n+1)*n/4;dp[0]=1;
  rep(i,1,n) v.pb(i);
  rep(i,0,n-1){
  rev(j,s,0){
  if (j-v[i]>=0) (dp[j]+=dp[j-v[i]])%=md;
  }
  }
  put(dp[s]);
  }
  signed main(){
  IOS;
  #ifdef LOCAL
  freopen("input.txt", "r" , stdin);
  freopen("output.txt", "w", stdout);
  #endif
  int t=1;
  //cin>>t;
  while(t--){
  solve();
  //cout<<'\n';
  }
  #ifdef LOCAL
  clock_t tStart = clock();
  cerr<<fixed<<setprecision(10)<<"\nTime Taken: "<<(double)(clock()- tStart)/CLOCKS_PER_SEC<<endl;
  #endif
  }

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