ZOJ1430 POJ1697 The Erythea Campaign

/*******************************************************************************
 # Author : Neo Fung
 # Email : [email protected]
 # Last modified: 2011-11-06 21:50
 # Filename: ZOJ1430 POJ1697 The Erythea Campaign.cpp
 # Description : 
 ******************************************************************************/
// #include "stdafx.h"
// #define DEBUG

#include <fstream>
#include <stdio.h>
#include <iostream>
#include <string.h>
#include <string>
#include <memory.h>
#include <limits.h>
#include <queue>
#define MAX 85
using namespace std;

int map[MAX][MAX];
int level[MAX][MAX];
int result[MAX][MAX];
int n,m;
struct NODE
{
	int x,y;
	int lev;
}end,start,ntemp;

queue<NODE> mq;

bool canNotVisit(const int &x,const int &y,const int mode)
{
	if(mode<4)
	{
		if(mode==0)
			return map[x-1][y-1] && map[x-1][y];
		else
			return map[x][y] && map[x][y-1];
	}
	else
	{
		if(mode==4)
			return map[x][y-1] && map[x-1][y-1];
		else
			return map[x][y] && map[x-1][y];
	}
}

void pushQueue(const int &x,const int &y,const int &lev)
{
	NODE temp;
	temp.x=x;
	temp.y=y;
	temp.lev=lev;
	mq.push(temp);
}

int main(void)
{
#ifdef DEBUG  
	freopen("data.txt","r",stdin);  
#endif  

	int dis[]={-1,0,1,0,0,-1,0,1};
	int ncases;
	char ch;
	int x,y,lev,a,b;
	scanf("%d",&ncases);
	while(ncases--)
	{
		scanf("%d%d",&n,&m);
		scanf("%d%d%d%d",&start.x,&start.y,&end.x,&end.y);

		memset(map,0,sizeof(map));
		memset(level,0,sizeof(level));
		for (int i=0;i<=n;++i)
			for (int j=0;j<=m;++j)
				result[i][j]=INT_MAX;

		for(int i=0;i<n;++i)
		{
			getchar();
			for(int j=0;j<m;++j)
			{
				scanf("%c",&ch);
				map[i][j]=ch-'0';
				if(map[i][j])
				{
					level[i][j]=level[i][j+1]=level[i+1][j]=level[i+1][j+1]=n+m;
					pushQueue(i,j,n+m);
					pushQueue(i,j+1,n+m);
					pushQueue(i+1,j,n+m);
					pushQueue(i+1,j+1,n+m);
				}
			}
		}

		while(!mq.empty())
		{
			ntemp=mq.front();
			mq.pop();
			x=ntemp.x,y=ntemp.y,lev=ntemp.lev-1;
			for(int i=0;i<8;i+=2)
			{
				a=x+dis[i];
				b=y+dis[i+1];
				if(a>=0 &&a<=n &&b>=0 &&b<=m && !canNotVisit(x,y,i) && lev>level[a][b])
				{
					level[a][b]=lev;
					ntemp.x=a;
					ntemp.y=b;
					ntemp.lev=lev;
					mq.push(ntemp);
				}
			}
		}
		start.lev=result[start.x][start.y]=level[start.x][start.y];
		end.lev=level[end.x][end.y];
		mq.push(start);
		while(!mq.empty())
		{
			ntemp=mq.front();
			mq.pop();
			x=ntemp.x;
			y=ntemp.y;
			lev=ntemp.lev;
			for(int i=0;i<8;i+=2)
			{
				a=x+dis[i];
				b=y+dis[i+1];
				if(a>=0 &&a<=n &&b>=0 &&b<=m && !canNotVisit(x,y,i) && lev+level[a][b]<result[a][b])
				{
					result[a][b]=lev+level[a][b];
					ntemp.x=a;
					ntemp.y=b;
					ntemp.lev=result[a][b];
					mq.push(ntemp);
				}
			}

		}
		if(result[end.x][end.y]==INT_MAX)
			printf("no solution\n");
		else
			printf("%d\n",result[end.x][end.y]);

	}
	return 0;
}