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Submission #524491

# Submission time Handle Problem Language Result Execution time Memory
524491 2022-02-09T09:47:42 Z Pety Beautiful row (IZhO12_beauty) C++14
100 / 100
 503 ms 205424 KB 
#include <bits/stdc++.h>
#define ll long long

using namespace std;

const int INF = 1e9;
const int MOD = 1e9 + 7;

int n, v[20], ok[20][20];
short bits[(1 << 20)][20];
long long dp[(1 << 20)][20];

int base2 (int x) {
  int cnt = 0;
  while (x) {
    if (x % 2 == 1)
      cnt++;
    x /= 2;
  }
  return cnt;
}

int base3 (int x) {
  int cnt = 0;
  while (x) {
    if (x % 3 == 1)
      cnt++;
    x /= 3;
  }

  return cnt;
}


int main () 
{
  ios_base::sync_with_stdio(false);
  cin.tie(0); cout.tie(0);
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> v[i];
  }
  for (int i = 0; i < n; i++) 
    for (int j = 0; j < n; j++)
      if (base2(v[i]) == base2(v[j]) || base3(v[i]) == base3(v[j]))
        ok[i][j] = 1;
  for (int i = 1; i < (1 << n); i++) {
    for (int j = 0; j < n; j++)
      if (i & (1 << j))
        bits[i][++bits[i][0]] = j;
  }
  for (int i = 1; i < (1 << n); i++) {
    if (bits[i][0] == 1) {
      dp[i][bits[i][1]] = 1;
      continue;
    }
    for (int j = 1; j <= bits[i][0]; j++)
      for (int k = 1; k <= bits[i][0]; k++)
        if (j != k) {
          int b1 = bits[i][j];
          int b2 = bits[i][k];
          if (ok[b1][b2])
          dp[i][b1] = (dp[i ^ (1 << b1)][b2] + dp[i][b1]);
        }
  }
  long long ans = 0;
  for (int i = 0; i < n; i++)
    ans += dp[(1 << n) - 1][i];  
  cout << ans;
  return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 332 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 1 ms 460 KB Output is correct
7 Correct 1 ms 460 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 460 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 5 ms 3532 KB Output is correct
12 Correct 5 ms 3532 KB Output is correct
13 Correct 22 ms 13124 KB Output is correct
14 Correct 111 ms 51500 KB Output is correct
15 Correct 101 ms 51660 KB Output is correct
16 Correct 116 ms 51524 KB Output is correct
17 Correct 122 ms 51524 KB Output is correct
18 Correct 134 ms 51540 KB Output is correct
19 Correct 503 ms 205424 KB Output is correct
20 Correct 458 ms 205400 KB Output is correct