Submission #1012090

#	Time	Username	Problem	Language	Result	Execution time	Memory
1012090		codefox	Longest beautiful sequence (IZhO17_subsequence)	C++14	Compilation error	0 ms	0 KiB

subsequence

#include<bits/stdc++.h>

using namespace std;

#define pii pair<int, int>
#define pipii pair<int, pii>

#pragma GCC optimize("Ofast")
#pragma GCC target("popcnt")

int N = 1<<20;

int main()
{
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);

    int n;
    cin >> n;
    
    vector<int> a(n);
    vector<int> k(n);

    for (int i = 0; i < n; i++) cin >> a[i];
    for (int i = 0; i < n; i++) cin >> k[i];

    vector<pii> best(n);

    for (int i = 0; i < n; i++)
    {
        best[i] = {1, -1};
        for (int j = 0; j < i; j++)
        {
            if (__popcount(a[j]&a[i])==k[i]) 
            {
                if (best[i].first<best[j].first+1) 
                {
                    best[i] = {best[j].first+1, j};
                }
            }
        }
    }

    int mx = 0;
    int nn = 0;
    for (int i = 0; i < n; i++)
    {
        if (best[i].first>mx)
        {
            mx = best[i].first;
            nn = i;
        }
    }
    cout << mx << "\n";
    vector<int> sol;
    while (nn != -1)
    {
        sol.push_back(nn);
        nn = best[nn].second;
    }
    reverse(sol.begin(), sol.end());
    for (int ele:sol) cout << ele+1 << " ";

    return 0;
}

Compilation message (stderr)

subsequence.cpp: In function 'int main()':
subsequence.cpp:34:17: error: '__popcount' was not declared in this scope
   34 |             if (__popcount(a[j]&a[i])==k[i])
      |                 ^~~~~~~~~~