Submission #678145

#	Time	Username	Problem	Language	Result	Execution time	Memory
678145		Tien_Noob	Longest beautiful sequence (IZhO17_subsequence)	C++17	100 / 100	3204 ms	52404 KiB

subsequence

//Make CSP great again
//Vengeance
#include <bits/stdc++.h>
#define TASK "TESTCODE"
#define Log2(x) 31 - __builtin_clz(x)
using namespace std;
const int N = 1e5;
int dp[1 << 10][1 << 10][11], f[N + 1], a[N + 1], b[N + 1], n, cbit[1 << 20];
void read()
{
    cin >> n;
    for (int i = 1; i <= n; ++ i)
    {
        cin >> a[i];
    }
    for (int i = 1; i <= n; ++ i)
    {
        cin >> b[i];
    }
}
void Traceback(int i, int nxt)
{
    if (i == 0)
    {
        return ;
    }
    if (f[i] + 1 == f[nxt] && cbit[a[i] & a[nxt]] == b[nxt])
    {
        Traceback(i - 1, i);
        cout << i << ' ';
    }
    else
    {
        Traceback(i - 1, nxt);
    }
}
void solve()
{
    for (int i = 1; i < (1 << 20); ++ i)
    {
        cbit[i] = __builtin_popcount(i);
    }
    for (int i = 1; i <= n; ++ i)
    {
        int pre = a[i] >> 10, suf = a[i] & ((1 << 10) - 1);
        f[i] = 1;
        for (int j = 0; j < (1 << 10); ++ j)
        {
            int k = cbit[pre & j];
            if (k > b[i] || b[i] - k > 10)
            {
                continue;
            }
            f[i] = max(f[i], dp[j][suf][b[i] - k] + 1);
        }
        for (int j = 0; j < (1 << 10); ++ j)
        {
            int k = cbit[suf & j];
            dp[pre][j][k] = max(dp[pre][j][k], f[i]);
        }
    }
    int root = max_element(f + 1, f + n + 1) - f;
    cout << f[root] << '\n';
    Traceback(root - 1, root);
    cout << root;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    if (fopen(TASK".INP", "r"))
    {
        freopen(TASK".INP", "r", stdin);
        //freopen(TASK".OUT", "w", stdout);
    }
    int t = 1;
    bool typetest = false;
    if (typetest)
    {
        cin >> t;
    }
    for (int __ = 1; __ <= t; ++ __)
    {
        //cout << "Case #" << __ << ":" << '\n';
        read();
        solve();
    }
}

Compilation message (stderr)

subsequence.cpp: In function 'int main()':
subsequence.cpp:73:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |         freopen(TASK".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 7 / 7
• Subtask 2: 16 / 16
• Subtask 3: 17 / 17
• Subtask 4: 60 / 60