Submission #91035

#	Time	Username	Problem	Language	Result	Execution time	Memory
91035		popovicirobert	Longest beautiful sequence (IZhO17_subsequence)	C++14	0 / 100	3 ms	628 KiB

subsequence

#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long
#define ld long double
// 217
// 44

using namespace std;

const int MAXN = (int) 1e5;

int aux[1 << 10][1 << 10][11], ind[1 << 10][1 << 10][11];

int arr[MAXN + 1], k[MAXN + 1];
int dp[MAXN + 1], to[MAXN + 1];

inline int get_last(int x) {
    return x & ((1 << 10) - 1);
}

inline int get_first(int x) {
    return x >> 10;
}

int cnt[1 << 10];

inline void update(int pos, int x) {
    int a = get_first(x), b = get_last(x);
    for(int i = 0; i < (1 << 10); i++) {
        int nr = cnt[b & i];
        if(aux[a][i][nr] < dp[pos]) {
            aux[a][i][nr] = dp[pos];
            ind[a][i][nr] = pos;
        }
    }
}

inline void query(int pos, int x) {
    int a = get_first(x), b = get_last(x);
    for(int i = 0; i < (1 << 10); i++) {
        int nr = cnt[a & i];
        if(k[pos] >= nr && k[pos] - nr <= 10 && dp[pos] < aux[i][b][k[pos] - nr] + 1) {
            dp[pos] = aux[i][b][k[pos] - nr] + 1;
            to[pos] = ind[i][b][k[pos] - nr];
        }
    }
}

int main() {
    //ifstream cin("A.in");
    //ofstream cout("A.out");
    int i, j, n;
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    cin >> n;
    for(i = 1; i <= n; i++) {
        cin >> arr[i];
    }
    for(i = 1; i <= n; i++) {
        cin >> k[i];
    }
    for(i = 0; i < (1 << 10); i++) {
        cnt[i] = __builtin_popcount(i);
    }
    for(i = 1; i <= n; i++) {
        query(i, arr[i]);
        update(i, arr[i]);
    }
    int ans = 0, pos;
    for(i = 1; i <= n; i++) {
        if(dp[i] > ans) {
            ans = dp[i];
            pos = i;
        }
    }
    vector <int> sol;
    while(pos > 0) {
        sol.push_back(pos);
        pos = to[pos];
    }
    reverse(sol.begin(), sol.end());
    cout << ans << "\n";
    for(auto it : sol) {
        cout << it << " ";
    }
    //cin.close();
    //cout.close();
    return 0;
}

Compilation message (stderr)

subsequence.cpp: In function 'int main()':
subsequence.cpp:53:12: warning: unused variable 'j' [-Wunused-variable]
     int i, j, n;
            ^

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