Submission #491351

#	Time	Username	Problem	Language	Result	Execution time	Memory
491351		acm	Beautiful row (IZhO12_beauty)	C++14	100 / 100	784 ms	180960 KiB

beauty

#ifdef ONLINE_JUDGE
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#endif
#include <bits/stdc++.h>
#define speed                   \
  ios_base::sync_with_stdio(0); \
  cin.tie(0);                   \
  cout.tie(0);
#define precision     \
  cout.precision(30); \
  cerr.precision(10);
#define ll long long
#define ld long double
#define pb(x) push_back(x)
#define sz(x) (int)x.size()
#define mp(x, y) make_pair(x, y)
#define all(x) x.begin(), x.end()
#define pc(x) __builtin_popcount(x)
#define pcll(x) __builtin_popcountll(x)
#define F first
#define S second
using namespace std;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
void ioi(string name) {
  freopen((name + ".in").c_str(), "r", stdin);
  freopen((name + ".out").c_str(), "w", stdout);
}
ll n, a[25], b[25], dp[1 << 22][22];
int main() {
  speed;
  precision;
  // code
  cin >> n;
  for (int i = 0; i < n; i++) {
    ll x;
    cin >> x;
    a[i] = pc(x);
    while (x > 0) {
      b[i] += ((x % 3) == 1);
      x /= 3;
    }
  }
  for (int i = 0; i < n; i++) dp[1 << i][i] = 1;
  for (int i = 0; i < (1 << n); i++) {
    for (int j = 0; j < n; j++) {
      if (i & (1 << j)) continue;
      for (int k = 0; k < n; k++) {
        if ((1 << k) & i) {
          if (a[k] == a[j] || b[k] == b[j]) dp[i | (1 << j)][j] += dp[i][k];
        }
      }
    }
  }
  cout << accumulate(dp[(1 << n) - 1], dp[(1 << n) - 1] + n, 0LL);
  // endl
#ifndef ONLINE_JUDGE
  cerr << "\nTime elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
#endif
  return 0;
}

Compilation message (stderr)

beauty.cpp: In function 'void ioi(std::string)':
beauty.cpp:26:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |   freopen((name + ".in").c_str(), "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
beauty.cpp:27:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |   freopen((name + ".out").c_str(), "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100