Submission #980413

#	Time	Username	Problem	Language	Result	Execution time	Memory
980413		sleepntsheep	Painting Walls (APIO20_paint)	C++11	40 / 100	1586 ms	110784 KiB

paint

#pragma GCC optimize("O2,unroll-loops")

#include "paint.h"
#include<stdio.h>
#include<map>
#include<time.h>
#include<stdlib.h>

int max(int i,int j){return i>j?i:j;}
int min(int i,int j){return i<j?i:j;}
void sort(int*a,int l,int r)
{
    while(l<r)
    {
        int i=l,j=l,k=r,t,p=a[l+rand()%(r-l)];
        while(j<k)
        {
            int c=a[j]-p;
            if(c<0)t=a[i],a[i]=a[j],a[j]=t,++i,++j;
            else if(!c)++j;
            else t=a[--k],a[k]=a[j],a[j]=t;
        }
        sort(a,l,i);
        l=k;
    }
}

#include <vector>

#define NN 100000
#define MM 50000
#define KK 100000

void push(int**eh,int*eo,int i,int j)
{
    int o=eo[i]++;
    if(!o)eh[i]=(int*)malloc(2*sizeof**eh);
    else if(!(o&o-1))eh[i]=(int*)realloc(eh[i],2*o*sizeof**eh);
    eh[i][o]=j;
}
void push_(int**eh,int*eo,int j) { return push(eh,eo,0,j); }

int*eh[MM],eo[MM],*fh[KK],fo[KK],freq[NN],*ll,lo,dp[NN];

int get(int cc, int pp)
{
    if(cc<0)return 0;
    int lb=-1,ub=eo[cc];
    while(ub-lb>1)
    {
        int mid=lb+(ub-lb)/2;
        if(eh[cc][mid]<=pp) lb=mid;
        else ub=mid;
    }
    if(lb==-1||eh[cc][lb]!=pp)return 0;
    return fh[cc][lb];
}

int minimumInstructions(
    int N, int M, int K, std::vector<int> C,
    std::vector<int> A, std::vector<std::vector<int>> B) {
    srand(time(0));

    for(int i=0;i<N;++i)push(fh,fo,C[i],i);

    for(int i=0;i<M;++i)
    {
        for(int j=0;j<A[i];++j)
            for(int k=0;k<fo[B[i][j]];++k)
                if(!freq[fh[B[i][j]][k]]++)
                    push(eh,eo,i,fh[B[i][j]][k]); // upperbound on #push is O(400000)
        sort(eh[i],0,eo[i]);
        for(int k=0;k<eo[i];++k)
            freq[eh[i][k]]=0;
    }

    for(int i=0;i<N;++i)fo[i]=0,free(fh[i]),fh[i]=0;

    for(int i=0;i<M;++i)
        for(int j=0;j<eo[i];++j)
            push(fh,fo,i,1+get(i-1,eh[i][j]-1));

    for(int i=0;i<M;++i)
        for(int j=0;j<eo[i];++j)
            fh[i][j]=min(M,max(fh[i][j],1+get((M+i-1)%M,eh[i][j]-1)));

    for(int i=0;i<M;++i)
        for(int j=0;j<eo[i];++j)
            // can paint [eh[i][j] - M + 1, eh[i][j]]
            if(fh[i][j]==M)
                push_(&ll,&lo,eh[i][j]-M+1);

    sort(ll,0,lo);

    for(int i=0;i<N;++i)
        dp[i]=1e9;

    {
        std::map<int,int>in={{1000000000,1}};
        static int *rr[NN],ro[NN];
        for(int i=0;i<N;++i)
            ro[i]=0,rr[i]=0;

        for(int i=0,j=0;i<N;++i)
        {
            while(j<lo&&ll[j]<=i)
            {
                int before=ll[j]==0?0:dp[ll[j]-1];
                ++in[before+1];
                if(i+M<N)
                    push(rr,ro,i+M,before+1);
                ++j;
            }
            for(int j=0;j<ro[i];++j)
            {
                int ii=rr[i][j];
                if(!--in[ii])in.erase(ii);
            }
            dp[i]=in.begin()->first;
        }

        for(int i=0;i<N;++i)
            free(rr[i]),rr[i]=0;
    }

    for(int i=0;i<M;++i)
        eo[i]=fo[i]=0,free(eh[i]),free(fh[i]),eh[i]=fh[i]=0;
    lo=0; free(ll),ll=0;

    return dp[N-1] >= 1e9 ? -1 : dp[N-1];
}

Compilation message (stderr)

paint.cpp: In function 'void push(int**, int*, int, int)':
paint.cpp:38:18: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   38 |     else if(!(o&o-1))eh[i]=(int*)realloc(eh[i],2*o*sizeof**eh);
      |                 ~^~

• Subtask 1: 12 / 12
• Subtask 2: 15 / 15
• Subtask 3: 13 / 13
• Subtask 4: 0 / 23
• Subtask 5: 0 / 37