Submission #202150

#	Time	Username	Problem	Language	Result	Execution time	Memory
202150		mdn2002	Longest beautiful sequence (IZhO17_subsequence)	C++14	0 / 100	5 ms	760 KiB

subsequence

#include<bits/stdc++.h>
using namespace std;
const int mod=1e9+7;
int n,a[100005],k[100005],dp[100005],dp1[100005],pth[100005],mx,in;
vector<int>ans;
bool t=false;
string to(int x)
{
    string s;
    while(x)
    {
        s.push_back('0'+(x%2));
        x/=2;
    }
    while(s.size()!=9)s.push_back('0');
    reverse(s.begin(),s.end());
    return s;
}
void bt(int x,int nm,string s,int ai,int aj,int i)
{
    if(x==s.size()&&nm==0)
    {
        if(dp[ai]<dp[aj]+1)
        {
            pth[i]=dp1[aj];
            dp1[ai]=i;
            dp[ai]=dp[aj]+1;
        }
    }
    if(x==s.size())return;
    if(s[x]=='0')
    {
        bt(x+1,nm,s,ai,aj*2,i);
        bt(x+1,nm,s,ai,aj*2+1,i);
    }
    else
    {
        bt(x+1,nm,s,ai,aj*2,i);
        bt(x+1,nm-1,s,ai,aj*2+1,i);
    }
}
void fp(int x)
{
    if(x==0)return;
    fp(pth[x]);
    ans.push_back(x);
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    //freopen("empty.in","r",stdin);
    //freopen("empty.out","w",stdout);
    cin>>n;
    for(int i=1; i<=n; i++)
    {
        cin>>a[i];
        dp[a[i]]=1;
        if(dp1[a[i]]==0)dp1[a[i]]=i;
    }
    for(int i=1; i<=n; i++)cin>>k[i];
    if(n<=5000)
    {
        memset(dp,0,sizeof dp);
        for(int i=1; i<=n; i++)
        {
            dp[i]=1;
            for(int j=1; j<i; j++)
            {
                if(__builtin_popcount((a[i]&a[j]))==k[i])
                {
                    if(dp[i]<dp[j]+1)
                    {
                        dp[i]=dp[j]+1;
                        pth[i]=j;
                    }
                }
            }
            mx=max(mx,dp[i]);
        }
        for(int i=1;i<=n;i++)
        {
            if(dp[i]==mx)in=i;
        }
        fp(in);
        cout<<mx<<endl;
        for(int i=0; i<mx; i++)cout<<ans[i]<<' ';
        return 0;
    }
    for(int i=1; i<=n; i++)
    {
        bt(0,k[i],to(a[i]),a[i],0,i);
        if(mx<dp[a[i]])
        {
            mx=dp[a[i]];
            in=i;
        }
    }
    fp(in);
    cout<<mx<<endl;
    for(int i=0; i<mx; i++)cout<<ans[i]<<' ';
}

Compilation message (stderr)

subsequence.cpp: In function 'void bt(int, int, std::__cxx11::string, int, int, int)':
subsequence.cpp:21:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(x==s.size()&&nm==0)
        ~^~~~~~~~~~
subsequence.cpp:30:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(x==s.size())return;
        ~^~~~~~~~~~

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