Submission #866177

#	Time	Username	Problem	Language	Result	Execution time	Memory
866177		andrei_boaca	Comparing Plants (IOI20_plants)	C++17	19 / 100	4056 ms	20760 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];
int dist(int a,int b)
{
    return (b-a+n)%n;
}
int myprv(int x)
{
    return (x-1+n)%n;
}
void init(int K, std::vector<int> 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)
    {
        for(int value=1;value<=n;value++)
        {
            vector<int> vals;
            for(int i=0;i<=2*n;i++)
            {
                mars[i]=0;
                can[i]=0;
            }
            for(int j=0;j<n;j++)
                if(!use[j])
                {
                    if(r[j]==k-1)
                    {
                        mars[j+1]++;
                        mars[j+k]--;
                    }
                    else
                        can[j]++;
                }
            ll valmin=1e16;
            for(int j=0;j<2*n;j++)
            {
                if(j>0)
                    mars[j]+=mars[j-1];
                can[j%n]+=mars[j];
            }
            for(int j=0;j<n;j++)
                valmin=min(valmin,can[j]);
            for(int j=0;j<n;j++)
                if(can[j]==valmin&&!use[j])
                    vals.push_back(j);
            if(vals.empty())
                break;
            for(int who:vals)
            {
                use[who]=1;
                v[who]=value;
                for(int j=myprv(who),cnt=1;cnt<k;cnt++,j=myprv(j))
                    r[j]++;
            }
        }
    }
}
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: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 11
• Subtask 6: 0 / 15
• Subtask 7: 0 / 25