Submission #94427

#	Time	Username	Problem	Language	Result	Execution time	Memory
94427		Kastanda	Longest beautiful sequence (IZhO17_subsequence)	C++11	40 / 100	133 ms	2936 KiB

subsequence

#include<bits/stdc++.h>
using namespace std;
const int N = 100005, MAX = 256;
int n, ts, A[N], K[N], dp[N], P[N], R[N];
pair < int , int > dp2[MAX];
inline void BruteForce()
{
    int nw = 0;
    for (int i = 1; i <= n; i++)
    {
        int k = K[i];
        int &Mx = dp[i], &a = A[i], &p = P[i];
        for (int j = 1; j < i; j++)
            if (__builtin_popcount(a & A[j]) == k && Mx < dp[j])
                {Mx = dp[j]; p = j;}
        dp[i] ++;
        if (dp[i] > dp[nw])
            nw = i;
    }
    while (nw)
    {
        R[ts ++] = nw;
        nw = P[nw];
    }
    printf("%d\n", ts);
    for (int i = ts - 1; ~i; i--)
        printf("%d ", R[i]);
    exit(0);
}
int main()
{
    scanf("%d", &n);
    for (int i = 1; i <= n; i++)
        scanf("%d", &A[i]);
    for (int i = 1; i <= n; i++)
        scanf("%d", &K[i]);

    if (n <= 10000)
        BruteForce();

    int nw = 0, _max = 0;
    for (int i = 1; i <= n; i++)
    {
        int Mx = 0;
        for (int j = 0; j < MAX; j++)
            if (__builtin_popcount(A[i] & j) == K[i] && Mx < dp2[j].first)
                Mx = dp2[j].first, P[i] = dp2[j].second;
        Mx ++;
        if (Mx > dp2[A[i]].first)
            dp2[A[i]] = {Mx, i};
        if (Mx > _max)
            nw = i, _max = Mx;
    }
    while (nw)
    {
        R[ts ++] = nw;
        nw = P[nw];
    }
    printf("%d\n", ts);
    for (int i = ts - 1; ~i; i--)
        printf("%d ", R[i]);
    return 0;
}

Compilation message (stderr)

subsequence.cpp: In function 'int main()':
subsequence.cpp:32:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d", &n);
     ~~~~~^~~~~~~~~~
subsequence.cpp:34:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &A[i]);
         ~~~~~^~~~~~~~~~~~~
subsequence.cpp:36:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &K[i]);
         ~~~~~^~~~~~~~~~~~~

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