Submission #681429

#	Time	Username	Problem	Language	Result	Execution time	Memory
681429		acm	Longest beautiful sequence (IZhO17_subsequence)	C++14	100 / 100	2575 ms	72904 KiB

subsequence

#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);
}
int n, a[100005], b[100005], c[1 << 21], p[100005], dp[100005], pd[2048][2048][15];
int main() {
  speed;
  precision;
  // code
  cin >> n;
  for (int i = 1; i <= n; i++) cin >> a[i];
  for (int i = 1; i <= n; i++) cin >> b[i];
  for (int i = 0; i < (1 << 20); i++) c[i] = pc(i);
  dp[0] = -1;
  for (int i = 1; i <= n; i++) {
    int x = (a[i] & ((1 << 10) - 1)), y = (a[i] >> 10), v = 0;
    for (int j = 0; j < (1 << 10); j++) {
      int k = b[i] - c[x & j];
      if (k < 0 || k > 10) continue;
      if (dp[v] < dp[pd[j][y][k]]) v = pd[j][y][k];
    }
    dp[i] = dp[v] + 1;
    p[i] = v;
    for (int j = 0; j < (1 << 10); j++) {
      int k = c[y & j];
      if (dp[i] > dp[pd[x][j][k]]) pd[x][j][k] = i;
    }
  }
  int v = max_element(dp + 1, dp + n + 1) - dp;
  vector<int> res;
  res.pb(v);
  while (p[v]) {
    v = p[v];
    res.pb(v);
  }
  reverse(all(res));
  cout << sz(res) << "\n";
  for (auto x : res) cout << x << " ";
// endl
#ifndef ONLINE_JUDGE
  cerr << "\nTime elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
#endif
  return 0;
}

Compilation message (stderr)

subsequence.cpp: In function 'void ioi(std::string)':
subsequence.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);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
subsequence.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: 7 / 7
• Subtask 2: 16 / 16
• Subtask 3: 17 / 17
• Subtask 4: 60 / 60