记录编号	117207	评测结果	AAAAAAAAAA
题目名称	[USACO Dec07] 泥潭	最终得分	100
用户昵称	HouJikan	是否通过	通过
代码语言	C++	运行时间	0.034 s
提交时间	2014-08-28 18:43:16	内存使用	1.47 MiB

#include <iostream>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <algorithm>
#include <queue>
#include <stack>
#include <map>
#include <set>
#include <list>
#include <vector>
#include <ctime>
#include <iterator>
#include <functional>
#define pritnf printf
#define scafn scanf
#define For(i,j,k) for(int i=(j);i<=(k);(i)++)
using namespace std;
typedef long long LL;
typedef unsigned int Uint; 
const int INF=0x7ffffff;
//==============struct declaration==============
struct points
{
  int x,y,dist;
  points(){};
  points(int x,int y,int dist):x(x),y(y),dist(dist){};
};
//==============var declaration=================
bool vis[1100][1100];
const int ADD=500;
int mvx[]={1,0,-1,0};
int mvy[]={0,-1,0,1};
//==============function declaration============

//==============main code=======================
int main()
{  
  string FileName="mud";//程序名 
  string FloderName="COGS";//文件夹名 
  freopen((FileName+".in").c_str(),"r",stdin);
  freopen((FileName+".out").c_str(),"w",stdout);
#ifdef DEBUG  
  system(("cp C:\\Users\\Administrator\\Desktop\\"+FloderName+"\\standard.cpp C:\\Users\\Administrator\\Desktop\\"+FloderName+"\\submit.txt").c_str());
  clock_t Start_Time=clock();
#endif    
  int n,ex,ey;
  scanf("%d%d%d",&ex,&ey,&n);
  memset(vis,false,sizeof(vis));
  For(i,1,n)
  {
    int x,y;
    scanf("%d%d",&x,&y);
    vis[x+ADD][y+ADD]=true;
  }
  queue <points> Q;
  points now;
  Q.push(points(0,0,0));
  while (!Q.empty())
  {
    now=Q.front();Q.pop();
    if (now.x==ex&&now.y==ey)
    {
      printf("%d\n",now.dist);
      return 0;
    }
    For(i,0,3)
    {
      int xx=now.x+mvx[i];
      int yy=now.y+mvy[i];
      if (xx>=-500&&xx<=500&&yy>=-500&&yy<=500)
      if (!vis[xx+ADD][yy+ADD])
      {
        vis[xx+ADD][yy+ADD]=true;
        Q.push(points(xx,yy,now.dist+1));
      }
    }
  }
#ifdef DEBUG  
  clock_t End_Time=clock();
  cout<<endl<<endl<<"Time Used: "<<End_Time-Start_Time<<endl;
#endif    
  return 0;
}
//================fuction code====================