Submission #58099

#	Time	Username	Problem	Language	Result	Execution time	Memory
58099		Benq	Longest beautiful sequence (IZhO17_subsequence)	C++14	100 / 100	5516 ms	132020 KiB

subsequence

#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;
 
typedef long long ll;
typedef long double ld;
typedef complex<ld> cd;

typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<ll> vl;
typedef vector<pi> vpi;
typedef vector<pl> vpl;
typedef vector<cd> vcd;

template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

#define FOR(i, a, b) for (int i=a; i<(b); i++)
#define F0R(i, a) for (int i=0; i<(a); i++)
#define FORd(i,a,b) for (int i = (b)-1; i >= a; i--)
#define F0Rd(i,a) for (int i = (a)-1; i >= 0; i--)

#define sz(x) (int)(x).size()
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()

const int MOD = 1000000007;
const ll INF = 1e18;
const int MX = 100001;

int n, a[MX], k[MX], pre[MX], bp[1024];
pi ans;
pi bes[1<<10][1<<10][11];

pi query(int x, int y) {
    pi ret = {0,0};
    int X = x&((1<<10)-1);
    F0R(i,1<<10) {
        int t = y-bp[(x>>10)&i];
        if (t >= 0 && t <= 10) ret = max(ret,bes[i][X][t]);
    }
    return ret;
}

void tri(pi& x, pi y) { x = max(x,y); }

void ins(int x, pi y) {
    F0R(i,1<<10) tri(bes[x>>10][i][bp[i&x]],y);
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
    F0R(i,1024) bp[i] = __builtin_popcount(i);
    cin >> n;
    FOR(i,1,n+1) cin >> a[i];
    FOR(i,1,n+1) cin >> k[i];
    FOR(i,1,n+1) {
        pi x = query(a[i],k[i]); 
        pre[i] = x.s; 
        x.f ++; x.s = i;
        ans = max(ans,x);
        ins(a[i],x);
    }
    cout << ans.f << "\n";
    vi v = {ans.s};
    while (v.back()) v.pb(pre[v.back()]);
    v.pop_back();
    reverse(all(v));
    for (int i: v) cout << i << " ";
}

/* Look for:
* the exact constraints (multiple sets are too slow for n=10^6 :( ) 
* special cases (n=1?)
* overflow (ll vs int?)
* array bounds
*/

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