Submission #1047920

#	Time	Username	Problem	Language	Result	Execution time	Memory
1047920		modwwe	Sequence (APIO23_sequence)	C++17	100 / 100	691 ms	56712 KiB

sequence

//https://www.instagram.com/_modwwe/
#pragma GCC optimize("Ofast,unroll-loops")
#include<bits/stdc++.h>
//#define int long long
//#define ll long long
#define down cout<<'\n';
#define debug cout<<" cucuucucuuu",down
#define NHP     ios_base::sync_with_stdio(0);cout.tie(0);cin.tie(0);
#define modwwe  int t;cin>>t; while(t--)
#define bit(i,j) (i>>j&1)
#define sobit(a) __builtin_popcountll(a)
#define task "test"
#define fin(x) freopen(x".inp","r",stdin)
#define fou(x) freopen(x".out","w",stdout)
#define pb push_back
#define checktime   cerr << (double)clock() / CLOCKS_PER_SEC * 1000  << " ms";
using namespace std;
void phongbeo();
const int inf=1e9;
const int mod2=1e9+7;
const int  mod1=998244353;
struct icd
{
    long double a;
    int b;
};
struct ib
{
    int a;
    int b;
};
struct ic
{
    int a,b,c;
};
struct id
{
    int a,b,c,d;
};
struct ie
{
    int a,b,c,d,e;

};

int n,m,s1,s2,s4,s3,sf,k,s5,s6,mx,s7,s8,s9,mx2,res,dem2=0,dem=0,s33,dem3,l,r,mid;
int  i,s10,s12;
int kk;
int el=29;
ib mer(ib a,ib b)
{
    return {max(a.a,b.a),min(a.b,b.b)};
}
struct IT
{
    ib t[2000005];
    int t2[2000005];
    int  t3[2000005];
    void build(int node,int l,int r)
    {
        if(l==r)
        {
            t[node]= {n-l+1,n-l+1};
            return;
        }
        int mid=l+r>>1;
        build(node<<1,l,mid);
        build(node<<1|1,mid+1,r);
        t[node]=mer(t[node<<1],t[node<<1|1]);
    }
    void ff(int x)
    {
        for(int i=x*2; i<=x*2+1; i++)
            t[i].a+=t2[x],
                    t[i].b+=t2[x],
                            t2[i]+=t2[x],
                                   t3[i]+=t3[x],
                                          t[i].a+=t3[x],
                                                  t[i].b-=t3[x];
        t2[x]=0;
        t3[x]=0;
    }

    void upd(int node,int l,int r,int l1,int r1,int x)
    {
        if(l>r1||r<l1) return;
        if(l>=l1&&r<=r1)
        {
            t[node].a+=x;
            t[node].b+=x;
            t2[node]+=x;
            return;
        }
        if(t2[node]!=0||t3[node]!=0) ff(node);
        int mid=l+r>>1;
        upd(node<<1,l,mid,l1,r1,x);
        upd(node<<1|1,mid+1,r,l1,r1,x);
        t[node]=mer(t[node<<1],t[node<<1|1]);
    }
    void upd2(int node,int l,int r,int l1,int r1,int x)
    {
        if(l>r1||r<l1) return;
        if(l>=l1&&r<=r1)
        {
            t[node].a+=x;
            t[node].b-=x;
            t3[node]+=x;
            return;
        }
        if(t2[node]!=0||t3[node]!=0) ff(node);
        int mid=l+r>>1;
        upd2(node<<1,l,mid,l1,r1,x);
        upd2(node<<1|1,mid+1,r,l1,r1,x);
        t[node]=mer(t[node<<1],t[node<<1|1]);
    }
    ib get(int node,int l,int r,int l1,int r1)
    {
        if(l>r1||r<l1) return {-inf,inf};
        if(l>=l1&&r<=r1) return t[node];
        if(t2[node]!=0||t3[node]!=0) ff(node);
        int mid=l+r>>1;
        return mer(get(node<<1,l,mid,l1,r1),get(node<<1|1,mid+1,r,l1,r1));
    }
    int walk(int node,int l,int r,int x,int y)
     {
         if(l==r) return l;
         int mid=l+r>>1;
                 if(t2[node]!=0||t3[node]!=0) ff(node);
if(t[node<<1].a-x>=0&&t[node<<1].b-y<=0) return walk(node<<1,l,mid,x,y);
return walk(node<<1|1,mid+1,r,x,y);
     }
} st;
vector<int> v[500002];
int sequence(int x,vector<int>_a)
{
    n=x;
    for(int i=0; i<x; i++)
        v[_a[i]].pb(i+1);
    st.build(1,1,n+1);
    s4=0;
    for(int i=1; i<=n; i++)
    {
        v[i].pb(n+1);
        dem=0;
        for(int j=0; j<v[i].size()-1; j++)
        {
            int x=v[i][j];
            int x2=v[i][j+1];
            st.upd(1,1,n+1,1,x,-1);
            ib xx=st.get(1,1,n+1,x,x2);
            st.upd2(1,1,n+1,1,x,1);
            s10=st.walk(1,1,n,xx.b,xx.a);

            dem++;

            s2=lower_bound(v[i].begin(),v[i].end(),s10)-v[i].begin();

            s4=max(s4,dem-s2);
        }
        for(int j=0; j<v[i].size()-1; j++)
        {
            x=v[i][j];
            st.upd(1,1,n+1,1,x,-1);
            st.upd2(1,1,n+1,1,x,-1);
        }

    }
    return s4;
}

Compilation message (stderr)

sequence.cpp: In member function 'void IT::build(int, int, int)':
sequence.cpp:66:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   66 |         int mid=l+r>>1;
      |                 ~^~
sequence.cpp: In member function 'void IT::upd(int, int, int, int, int, int)':
sequence.cpp:95:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   95 |         int mid=l+r>>1;
      |                 ~^~
sequence.cpp: In member function 'void IT::upd2(int, int, int, int, int, int)':
sequence.cpp:111:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  111 |         int mid=l+r>>1;
      |                 ~^~
sequence.cpp: In member function 'ib IT::get(int, int, int, int, int)':
sequence.cpp:121:18: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  121 |         int mid=l+r>>1;
      |                 ~^~
sequence.cpp: In member function 'int IT::walk(int, int, int, int, int)':
sequence.cpp:127:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  127 |          int mid=l+r>>1;
      |                  ~^~
sequence.cpp: In function 'int sequence(int, std::vector<int>)':
sequence.cpp:145:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  145 |         for(int j=0; j<v[i].size()-1; j++)
      |                      ~^~~~~~~~~~~~~~
sequence.cpp:160:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  160 |         for(int j=0; j<v[i].size()-1; j++)
      |                      ~^~~~~~~~~~~~~~

• Subtask 1: 11 / 11
• Subtask 2: 17 / 17
• Subtask 3: 7 / 7
• Subtask 4: 12 / 12
• Subtask 5: 13 / 13
• Subtask 6: 22 / 22
• Subtask 7: 18 / 18