Submission #1006662

#	Time	Username	Problem	Language	Result	Execution time	Memory
1006662		emad234	Longest beautiful sequence (IZhO17_subsequence)	C++17	23 / 100	48 ms	10968 KiB

subsequence

#include "bits/stdc++.h"
#define F first
#define S second
#define ll long long
#define pii pair<ll,ll>
const ll mxN = 5e5 + 5;
const ll mod = 1e9 + 7;
using namespace std;
int a[mxN],b[mxN];
int dp[mxN];
int opt[mxN],opid[mxN];
vector<int>op[256];
int prv[mxN];
signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n;
    cin>>n;
    for(int i = 1;i <= n;i++){
        cin >>a[i];
    }
    for(int i = 1;i <= n;i++){
        cin >>b[i];
    }
    if(n > 5000){
        for(int i = 0;i <= 256;i++){
            for(int x = 0;x <= 256;x++){
                if(__builtin_popcount(a[i] & x) == b[i]) op[i].push_back(x);
            }
        }
    }
    int ans = 1;
    int mxid = 1;
    dp[1] = 1;
    if(n > 5000){
        opt[a[1]] = 1;
        opid[a[1]] = 1;
        for(int i = 2;i <= n;i++){
            dp[i] = 1;
            for(auto x : op[a[i]]){
                if(opt[x] >= dp[i]){
                    dp[i] = opt[x] + 1;
                    prv[i] = opid[x];
                }
            }
            if(opt[a[i]] < dp[i]){
                opt[a[i]] = dp[i];
                opid[a[i]] = i;
            }
            if(dp[i] > ans){
                ans = dp[i];
                mxid = i;
            }
        }
    }else{
        for(int i = 2;i <= n;i++){
            dp[i] = 1;
            for(int j = 1;j < i;j++){
                if(__builtin_popcount(a[i] & a[j]) == b[i]) {
                    if(dp[j] + 1 > dp[i]){
                        dp[i] = dp[j] + 1;
                        prv[i] = j;
                    }
                }
            }
            if(dp[i] > ans){
                ans = dp[i];
                mxid = i;
            }
        }
    }
    cout<< ans<<'\n';
    vector<int>v;
    while(mxid){
        v.push_back(mxid);
        mxid = prv[mxid];
    }
    reverse(v.begin(),v.end());
    for(auto x : v) cout<<x<<' ';

}

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