记录编号	118470	评测结果	AAAAAAAAAA
题目名称	[NOIP 2010冲刺十三]迷之阶梯	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	0.013 s
提交时间	2014-09-07 09:14:57	内存使用	1.29 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 node
{
  int pos;int power;
  node (int pos=0,int power=0):pos(pos),power(power){}
};
//==============var declaration=================
const int MAXN=510;
int n;
LL h[MAXN];
int f[MAXN][500];//f[i][j]表示在台阶i蓄力j的最短时间 
//==============function declaration============

//==============main code=======================
int main()
{  
  string FileName="ladder";//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    
  scanf("%d",&n);
  For(i,1,n)
    scanf("%lld",&h[i]);
  h[n+1]=INF;
  memset(f,-1,sizeof(f));
  f[1][0]=0;
  queue <node>Q;
  Q.push(node(1,0));
  while (!Q.empty())
  {
    node now=Q.front();Q.pop();
    if (now.pos==n)
    {
      printf("%d\n",f[n][now.power]);
      return 0;
    }
    if (now.pos!=1&&(f[now.pos-1][now.power+1]==-1||f[now.pos-1][now.power+1]>f[now.pos][now.power]+1))
    {
      Q.push(node(now.pos-1,now.power+1));
      f[now.pos-1][now.power+1]=f[now.pos][now.power]+1;
    }
    for(int i=now.pos+1;i<=n&&h[i]-h[now.pos]<=(1<<now.power);i++)
      if (f[i][0]==-1||f[i][0]>f[now.pos][now.power]+1)
      {
        Q.push(node(i,0));
        f[i][0]=f[now.pos][now.power]+1;
      }   
  }
  printf("-1\n");
#ifdef DEBUG  
  clock_t End_Time=clock();
  cout<<endl<<endl<<"Time Used: "<<(End_Time-Start_Time)/CLOCKS_PER_SEC<<endl;
#endif    
  return 0;
}
//================fuction code====================