Submission #866230

#	Time	Username	Problem	Language	Result	Execution time	Memory
866230		andrei_boaca	Comparing Plants (IOI20_plants)	C++17	49 / 100	907 ms	45856 KiB

plants

#include "plants.h"
#include <bits/stdc++.h>
//#include "grader.cpp"
using namespace std;
typedef long long ll;
vector<int> muchii[200005];
int n,bigger[200005],smaller[200005],lastsmall[200005],lastbig[200005],k,v[200005];
bool use[200005];
ll mars[500005],can[500005];
vector<int> R;
int dist(int a,int b)
{
    return (b-a+n)%n;
}
int myprv(int x)
{
    return (x-1+n)%n;
}
struct aint
{
    int maxim,minim,pozmax,pozmin;
    int toprop;
} arb[3][4*200005];
vector<int> who;
aint combine(aint a,aint b)
{
    aint rez;
    rez.toprop=0;
    rez.maxim=a.maxim;
    rez.pozmax=a.pozmax;
    if(b.maxim>rez.maxim)
    {
        rez.maxim=b.maxim;
        rez.pozmax=b.pozmax;
    }

    rez.minim=a.minim;
    rez.pozmin=a.pozmin;
    if(b.minim<rez.minim)
    {
        rez.minim=b.minim;
        rez.pozmin=b.pozmin;
    }
    return rez;
}
void prop(int ind,int nod)
{
    int val=arb[ind][nod].toprop;
    arb[ind][nod*2].toprop+=val;
    arb[ind][nod*2].maxim+=val;
    arb[ind][nod*2].minim+=val;

    arb[ind][nod*2+1].toprop+=val;
    arb[ind][nod*2+1].maxim+=val;
    arb[ind][nod*2+1].minim+=val;
}
void build(int ind,int nod,int st,int dr)
{
    arb[ind][nod].toprop=0;
    if(st==dr)
    {
        arb[ind][nod].minim=arb[ind][nod].maxim=R[st]*(ind==1);
        arb[ind][nod].pozmin=arb[ind][nod].pozmax=st;
        return;
    }
    int mij=(st+dr)/2;
    build(ind,nod*2,st,mij);
    build(ind,nod*2+1,mij+1,dr);
    arb[ind][nod]=combine(arb[ind][nod*2],arb[ind][nod*2+1]);
}
void update(int ind,int nod,int st,int dr,int a,int b,int val)
{
    if(st!=dr)
        prop(ind,nod);
    arb[ind][nod].toprop=0;
    if(st>=a&&dr<=b)
    {
        arb[ind][nod].maxim+=val;
        arb[ind][nod].minim+=val;
        arb[ind][nod].toprop+=val;
        return;
    }
    int mij=(st+dr)/2;
    if(a<=mij)
        update(ind,nod*2,st,mij,a,b,val);
    if(b>mij)
        update(ind,nod*2+1,mij+1,dr,a,b,val);
    arb[ind][nod]=combine(arb[ind][nod*2],arb[ind][nod*2+1]);
}
void getwho(int ind,int nod,int st,int dr,int a,int b)
{
    if(st!=dr)
        prop(ind,nod);
    arb[ind][nod].toprop=0;
    if(arb[ind][nod].maxim<k-1)
        return;
    if(st==dr)
    {
        who.push_back(st);
        return;
    }
    int mij=(st+dr)/2;
    if(a<=mij)
        getwho(ind,nod*2,st,mij,a,b);
    if(b>mij)
        getwho(ind,nod*2+1,mij+1,dr,a,b);
}
void plsadd(int ind,int st,int lg,int val)
{
    if(st+lg-1<=n-1)
    {
        update(ind,1,0,n-1,st,st+lg-1,val);
        return;
    }
    update(ind,1,0,n-1,st,n-1,val);
    update(ind,1,0,n-1,0,(st+lg-1)%n,val);
}
void guesswho(int ind,int st,int lg)
{
    who.clear();
    if(st+lg-1<=n-1)
    {
        getwho(ind,1,0,n-1,st,st+lg-1);
        return;
    }
    getwho(ind,1,0,n-1,st,n-1);
    getwho(ind,1,0,n-1,0,(st+lg-1)%n);
}
void init(int K, std::vector<int> r)
{
    R=r;
    n=r.size();
    k=K;
    for(int i=0;i<n;i++)
    {
        lastbig[i]=-1;
        lastsmall[i]=-1;
    }
    for(int i=0;i<n;i++)
    {
        if(r[i]==0)
        {
            int j=(i-1+n)%n;
            while(r[j]==1)
            {
                lastsmall[j]=i;
                j=(j-1+n)%n;
            }
        }
        if(r[i]==1)
        {
            int j=(i-1+n)%n;
            while(r[j]==0)
            {
                lastbig[j]=i;
                j=(j-1+n)%n;
            }
        }
    }
    if(k>2)
    {
        build(1,1,0,n-1);
        build(2,1,0,n-1);
        for(int i=0;i<n;i++)
        {
            if(r[i]==k-1)
                plsadd(2,(i+1)%n,k-1,1);
            else
                plsadd(2,i,1,1);
        }
        for(int value=1;value<=n;value++)
        {
            int poz=arb[2][1].pozmin;
            assert(arb[2][1].minim==0);
            v[poz]=value;
            plsadd(2,poz,1,1e6);
            plsadd(2,(poz+1)%n,k-1,-1);
            plsadd(1,poz,1,-1e6);
            int p=(poz-(k-1)+n)%n;
            plsadd(1,p,k-1,1);
            guesswho(1,p,k-1);
            for(auto i:who)
            {
                plsadd(2,i,1,-1);
                plsadd(2,(i+1)%n,k-1,1);
            }
        }
    }
}
int compare_plants(int x, int y)
{
    if(k==2)
    {
        if(lastsmall[x]!=-1&&dist(x,y)+dist(y,lastsmall[x])==dist(x,lastsmall[x]))
            return -1;
        if(lastbig[x]!=-1&&dist(x,y)+dist(y,lastbig[x])==dist(x,lastbig[x]))
            return 1;
        if(lastsmall[y]!=-1&&dist(y,x)+dist(x,lastsmall[y])==dist(y,lastsmall[y]))
            return 1;
        if(lastbig[y]!=-1&&dist(y,x)+dist(x,lastbig[y])==dist(y,lastbig[y]))
            return -1;
        return 0;
    }
    if(v[x]<v[y])
        return -1;
    if(v[x]>v[y])
        return 1;
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 14 / 14
• Subtask 3: 13 / 13
• Subtask 4: 17 / 17
• Subtask 5: 0 / 11
• Subtask 6: 0 / 15
• Subtask 7: 0 / 25