Submission #15657

#	Time	Username	Problem	Language	Result	Execution time	Memory
15657		progressive	Wombats (IOI13_wombats)	C++14	27 / 100	2997 ms	177028 KiB

wombats

#include "wombats.h"
#include <cstdlib>
#include <cstdio>
#include <queue>
#include <cstring>
using namespace std;
static const int bucket=10; 
static const int MAXN=1<<9;
static const int MAXC=200;
static int idx[2*MAXN][MAXC][MAXC]; //78.125MB
static int R;
static int C;
static int H[MAXN*bucket][MAXC];//3.90625MB
static int V[MAXN*bucket][MAXC];//3.90625MB
static void dijkFunction(int a)
{
	int saveidx=a+MAXN;
	int bias=a*bucket;
	int dijk[bucket+1][MAXC];
	if(bias>=R)
	{
		idx[saveidx][0][0]=-1;
		return;
	}	
	for(int i=0;i<C;i++)
	{
		memset(dijk,-1,sizeof(dijk) );
		priority_queue<pair<int,pair<int,int> > > PQ;
		PQ.push(make_pair(-0,make_pair(0,i)));
		while(!PQ.empty())
		{
			int dist=-PQ.top().first;
			int xcord=PQ.top().second.first;
			int ycord=PQ.top().second.second;
			PQ.pop();
			if(dijk[xcord][ycord]!=-1) continue;
			dijk[xcord][ycord]=dist;
			if(xcord==bucket) continue;
			if(xcord==R-bias) continue;
			if(xcord!=R-bias-1) PQ.push(make_pair(-(dist+V[xcord+bias][ycord]),make_pair(xcord+1,ycord)));
			if(ycord!=0)
				PQ.push(make_pair(-(dist+H[xcord+bias][ycord-1]),make_pair(xcord,ycord-1)));
			if(ycord!=C-1)
				PQ.push(make_pair(-(dist+H[xcord+bias][ycord]),make_pair(xcord,ycord+1)));
		}
		for(int j=0;j<C;j++)
			idx[saveidx][i][j]=dijk[min(R-1-bias,bucket)][j];
	}
}
static void updateidx(int ind)
{
	int ind1=ind*2, ind2=ind*2+1;
	if(idx[ind2][0][0]<0)
	{
		for(int i=0;i<C;i++)
			for(int j=0;j<C;j++)
				idx[ind][i][j]=idx[ind1][i][j];
		return;
	}
	for(int imj=1-C;imj<=C-1;imj++)
	{
		int k=0; // using k as path
		for(int i=0;i<C;i++)
		{
			int j=i-imj;
			if(j<0 || j>=C) continue;
			while(k<C-1)
			{
				if(idx[ind1][i][k]+idx[ind2][k][j]<=idx[ind1][i][k+1]+idx[ind2][k+1][j]) break;
				k++;
			}
			idx[ind][i][j]=idx[ind1][i][k]+idx[ind2][k][j];
		}
	}
	/*
	//red herring
	for(int i=0;i<C;i++)
		for(int j=0;j<C;j++)
		{
			idx[ind][i][j]=0x3f3f3f3f;
			for(int k=0;k<C;k++)
				idx[ind][i][j]=min(idx[ind][i][j],idx[ind1][i][k]+idx[ind2][k][j]);
		}
	//*/
}
void init(int R, int C, int H[5000][200], int V[5000][200])
{
	::R=R;
	::C=C;
	for(int i=0;i<R;i++)
		for(int j=0;j<C-1;j++)
			::H[i][j]=H[i][j];
	for(int i=0;i<R-1;i++)
		for(int j=0;j<C;j++)
			::V[i][j]=V[i][j];
	for(int i=0;i<MAXN;i++) dijkFunction(i);
	for(int i=MAXN-1;i>0;i--)
		updateidx(i);
}
static void refresh(int a)
{

	dijkFunction(a);
	a+=MAXN;
	while(a!=1)
	{
		a/=2;
		updateidx(a);
	}
	return;
}
void changeH(int P, int Q, int W)
{
	int rbucket=P/bucket;
	H[P][Q]=W;
	refresh(rbucket);
}

void changeV(int P, int Q, int W)
{
	int rbucket=P/bucket;
	V[P][Q]=W;
	refresh(rbucket);
}

int escape(int V1, int V2)
{
	return idx[1][V1][V2];
}	

• Subtask 1: 9 / 9
• Subtask 2: 0 / 12
• Subtask 3: 0 / 16
• Subtask 4: 18 / 18
• Subtask 5: 0 / 21
• Subtask 6: 0 / 24