Submission #172925

#	Time	Username	Problem	Language	Result	Execution time	Memory
172925		VEGAnn	Longest beautiful sequence (IZhO17_subsequence)	C++14	0 / 100	3 ms	504 KiB

subsequence

#include <bits/stdc++.h>
//#pragma GCC optimize ("unroll-loops")
//#pragma GCC optimize ("-O3")
//#pragma GCC optimize ("Ofast")
#define sz(x) ((int)x.size())
#define PB push_back
#define all(x) x.begin(),x.end()
using namespace std;
const int N = 100100;
//const int N2 = N * N;
const int PW = 8;
const int VL = (1 << PW) + 1;
const int oo = 2e9;
vector<int> vc;
int n, a[N], k[N], pr[N], f[N], ans = 0, nm = -1, ff[VL], loc[VL];

bool ok(int x, int y){
    return (__builtin_popcount(a[x] & a[y]) == k[y]);
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
//    freopen("in.txt","r",stdin);

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

    fill(loc, loc + VL, -1);

    for (int i = 0; i < n; i++) {
        f[i] = 1;
//        for (int j = i - 1; j >= 0; j--)
//            if (f[j] + 1 > f[i] && ok(j, i)){
//                f[i] = f[j] + 1;
//                pr[i] = j;
//            }

        for (int j = 0; j < VL; j++){
            if (loc[j] < 0) continue;
            if (f[loc[j]] + 1 > f[i] && ok(loc[j], i)){
                f[i] = f[loc[j]] + 1;
                pr[i] = loc[j];
            }
        }

        if (f[i] > ans){
            ans = f[i];
            nm = i;
        }
        if (f[i] > ff[a[i]]){
            ff[a[i]]= f[i];
            loc[a[i]] = i;
        }
    }

    for (;;){
        vc.PB(nm + 1);
        if (f[nm] == 1) break;
        nm = pr[nm];
    }

    reverse(all(vc));
    cout << sz(vc) << '\n';
    for (int x : vc)
        cout << x << " ";
    return 0;
}

• Subtask 1: 0 / 7
• Subtask 2: 0 / 16
• Subtask 3: 0 / 17
• Subtask 4: 0 / 60