HDU 2006-2009

  今天刷了四道题目，虽然同样都是解简单题目，但是慢慢还是会感觉自己解题的速度有所提升。很期待能去解一些难的题目，但还是循序渐进吧，一步一个脚印。以下是解题步骤

HDU 2006

 /* THE PROGRAM IS MADE BY SH */
/*---------------------------------------------------------------------------
 *       http://acm.hdu.edu.cn/showproblem.php?pid=2006
 *       给你n个整数，求他们中所有奇数的乘积。
 *       Date  : 2015/4/22
----------------------------------------------------------------------------*/
#include 
#include 
#include 
#include 
#include 
#include 
#include 

using namespace std;

int main()
{
  int n,a;
  int y = 1;
  while(scanf("%d", &n) != EOF){
      for(int i = 0; i < n; ++i){
          scanf("%d", &a);
          if( a % 2 != 0){
              y *= a;
          }        
      } 
      printf("%d\n", y);
      y = 1;  
  }
  system("Pause");
  return 0;
}

HDU 2007

 /* THE PROGRAM IS MADE BY SH */
/*---------------------------------------------------------------------------
 *       http://acm.hdu.edu.cn/showproblem.php?pid=2007
 *       给定一段连续的整数，求出他们中所有偶数的平方和以及所有奇数的立方和。
 *       Date  : 2015/4/22
----------------------------------------------------------------------------*/
#include 
#include 
#include 
#include 
#include 
#include 
#include 

using namespace std;

int main()
{
  int x,y,temp;
  int sum=0,sum2=0;
  while(scanf("%d%d", &x, &y) !=EOF ){
      if(x > y){
          temp = x;
          x = y;
          y = temp;
          }
      for(int i = x; i <= y; ++i ){
          if( i%2 == 0 ){
              sum += i * i;
              }
          else{
              sum2 += i * i * i;
              }
      }  
      printf("%d %d\n",sum,sum2);
      sum=0;
      sum2=0;
  }      
  system("Pause");    
  return 0;
}

HDU 2008

 /* THE PROGRAM IS MADE BY SH */
/*---------------------------------------------------------------------------
 *       http://acm.hdu.edu.cn/showproblem.php?pid=2008
 *       统计给定的n个数中，负数、零和正数的个数。
 *       Date  : 2015/4/22
----------------------------------------------------------------------------*/
#include 
#include 
#include 
#include 
#include 
#include 
#include 

using namespace std;

int main()
{
  int num[3] ={0, 0, 0};
  int n;
  double a; 
  while(scanf("%d", &n) != EOF){
      for(int i = 0; i < n; ++i ){
          scanf("%lf", &a);
          if(a < 0.0){
              ++num[0];     
          }
          if( a == 0.0){
              ++num[1];
          }
          if( a >0.0){
              ++num[2];
          }         
      }
      if( n !=0 && n< 100 ){
      printf("%d %d %d\n", num[0], num[1], num[2]);   
      num[0] = num[1] = num[2] = 0;
      }        
  }
  system("Pause");
  return 0;
}

HDU 2009

 /* THE PROGRAM IS MADE BY SH */
/*---------------------------------------------------------------------------
 *       http://acm.hdu.edu.cn/showproblem.php?pid=2009
 *       求数列的和
 *       Date  : 2015/4/22
----------------------------------------------------------------------------*/
#include 
#include 
#include 
#include 
#include 
#include 
#include 

using namespace std;

int main()
{
  double n,m;  
  double sum = 0;
  while(scanf("%lf%lf", &n, &m) != EOF && n <10000 & m<1000){
      sum += n;
      for( int i =0; i < m-1; ++i){
           n = sqrt(n);
           sum += n;
      }
      printf("%.2lf\n", sum);
      sum = 0;
  }
  system("Pause");
  return 0;
}