Submission #1092121

#	Time	Username	Problem	Language	Result	Execution time	Memory
1092121		juicy	Beautiful row (IZhO12_beauty)	C++17	100 / 100	819 ms	172800 KiB

beauty

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

int C2(int x) {
  return __builtin_popcount(x);
}

int C3(int x) {
  int cnt = 0;
  while (x) {
    cnt += x % 3 == 1;
    x /= 3;
  }
  return cnt;
}

int main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);

  int n; cin >> n;
  vector<int> a(n);
  for (int &x : a) {
    cin >> x;
  }
  vector b(n, vector<bool>(n));
  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < n; ++j) {
      b[i][j] = C2(a[i]) == C2(a[j]) || C3(a[i]) == C3(a[j]);
    }
  }
  vector dp(n, vector<long long>(1 << n, 0));
  for (int i = 0; i < n; ++i) {
    dp[i][1 << i] = 1;
  }
  for (int m = 0; m < 1 << n; ++m) {
    for (int i = 0; i < n; ++i) {
      if (dp[i][m]) {
        for (int j = 0; j < n; ++j) {
          if (!(m >> j & 1) && b[i][j]) {
            dp[j][m + (1 << j)] += dp[i][m];
          }
        }
      }
    }
  }
  long long res = 0;
  for (int i = 0; i < n; ++i) {
    res += dp[i][(1 << n) - 1];
  }
  cout << res;
  return 0;
}

• Subtask 1: 100 / 100