Submission #705695

#	Time	Username	Problem	Language	Result	Execution time	Memory
705695		abysmal	Longest beautiful sequence (IZhO17_subsequence)	C++14	7 / 100	2 ms	596 KiB

subsequence

#include<iostream>
#include<stdio.h>
#include<stdint.h>
#include<vector>
#include<algorithm>
#include<utility>
#include<set>
#include<map>
#include<queue>
#include<stack>
#include<deque>
#include<string>
#include<time.h>
#include<iomanip>
#include<assert.h>
#include<math.h>
#include<chrono>
#include<random>
#include<bitset>

using namespace std;

const int64_t INF = (int64_t) 5 * 1e5 + 5;
const int64_t mINF = (int64_t) 1e9 + 5;
const int64_t MOD = (int64_t) 1e9 + 9;
const int nbit = 30;
const int ndig = 10;
const int nchar = 26;
const int p1 = 31;
const int p2 = 53;
const int D = 4;
int dr[D] = {0, 1, 0, -1};
int dc[D] = {1, 0, -1, 0};
// 0 right // 1 down // 2 left // 3 up

struct Solution
{
    int n;
    vector<int> a;
    vector<int> k;
    Solution() {}

    void solve()
    {
        cin >> n;
        a.resize(n, 0);
        k.resize(n, 0);
        for(int i = 0; i < n; i++)
        {
            cin >> a[i];
        }

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

        if(n <= 1e3) Sub12();
        else Sub3();
    }

    void Sub3()
    {
        int max_ = (1 << 8) + 5;
        vector<int> dp(n, 1);
        vector<int> p(n, -1);
        vector<int> pos(max_, -1);
        for(int i = 0; i < n; i++)
        {
            int id = -1;
            for(int val = 0; val < max_; val++)
            {
                int cnt = __builtin_popcount(a[i] & val);
                if(cnt != k[i] || pos[val] == -1) continue;

                if(dp[i] < dp[pos[val]] + 1)
                {
                    dp[i] = dp[pos[val]] + 1;
                    id = pos[val];
                }
            }
            p[i] = id;

            if(pos[a[i]] == -1 || (pos[a[i]] != -1 && dp[pos[a[i]]] < dp[i])) pos[a[i]] = i;
        }

        int e = -1;
        int ans = 0;
        for(int i = 0; i < n; i++)
        {
            if(ans >= dp[i]) continue;

            e = i;
            ans = max(ans, dp[i]);
        }

        vector<int> path;
        while(e != -1)
        {
            path.push_back(e + 1);

            e = p[e];
        }

        cout << ans << "\n";
        reverse(path.begin(), path.end());
        for(int i = 0; i < (int) path.size(); i++)
        {
            cout << path[i] << " ";
        }
        cout << "\n";
    }

    void Sub12()
    {
        vector<int> dp(n, 1);
        vector<int> p(n, -1);
        for(int i = 0; i < n; i++)
        {
            for(int j = 0; j < i; j++)
            {
                int b = __builtin_popcount((a[j] & a[i]));
                if(b != k[i] || dp[i] >= dp[j] + 1) continue;

                p[i] = j;
                dp[i] = dp[j] + 1;
            }
        }

        int e = -1;
        int ans = 0;
        for(int i = 0; i < n; i++)
        {
            if(ans >= dp[i]) continue;

            e = i;
            ans = max(ans, dp[i]);
        }

        vector<int> path;
        while(e != -1)
        {
            path.push_back(e + 1);

            e = p[e];
        }

        cout << ans << "\n";
        reverse(path.begin(), path.end());
        for(int i = 0; i < (int) path.size(); i++)
        {
            cout << path[i] << " ";
        }
        cout << "\n";
    }
};

void __startup()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);

//    freopen("in.txt", "r", stdin);
//    freopen("out.txt", "w", stdout);
}

int main()
{
    __startup();
    int t = 1;
//    cin >> t;

    for(int i = 1; i <= t; i++)
    {
        Solution().solve();
    }

    return 0;
}

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