Submission #62064596

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#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define all(x) (x).begin(), (x).end()
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rrep(i, n) for(int i = (int)(n - 1); i >= 0; i--)
template <typename T> bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template <typename T> bool chmin(T &a,const T &b){if(a>b){a=b;return true;}return false;}
using ll = long long;
#define int ll
using vi = vector<int>;
using vvi = vector<vector<int>>;
using vb = vector<bool>;
using vvb = vector<vector<bool>>;
using vs = vector<string>;
using pii = pair<int, int>;
/*
using mint = modint;
using vm = vector<mint>;
using vvm = vector<vector<mint>>;
 
 
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#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define all(x) (x).begin(), (x).end()
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rrep(i, n) for(int i = (int)(n - 1); i >= 0; i--)
template <typename T> bool chmax(T &a,const T &b){if(a<b){a=b;return true;}return false;}
template <typename T> bool chmin(T &a,const T &b){if(a>b){a=b;return true;}return false;}
using ll = long long;
#define int ll
using vi = vector<int>;
using vvi = vector<vector<int>>;
using vb = vector<bool>;
using vvb = vector<vector<bool>>;
using vs = vector<string>;
using pii = pair<int, int>;
/*
using mint = modint;
using vm = vector<mint>;
using vvm = vector<vector<mint>>;
*/

signed main(){
  int n; cin >> n;
  vi a(n); rep(i, n) cin >> a.at(i);
  vi per(n, 0);
  vi finish(n); rep(i, n) finish.at(i) = i;
  set<int> ans;
  while(true){
    vi b(n, 0);
    rep(i, n) b.at(per.at(i)) += a.at(i);
    int sum = 0;
    //rep(i, n) cerr << b.at(i) << (i == n - 1 ? '\n' : ' ');
    rep(i, n) sum ^= b.at(i);
    ans.insert(sum);
    per.at(n - 1)++;
    bool finish = false;
    rrep(i, n){
      if(i == 0){
        finish = true;
        break;
      }
      if(per.at(i) != i + 1) break;
      per.at(i) = 0;
      per.at(i - 1)++;
    }
    if(finish) break;
  }
  cout << ans.size() << endl;
}

Submission Info

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