亚洲男人的天堂在线aⅴ视频,一区二区三区免费在线观看,久久狠狠一本精品综合网

Ural 1047 Simple calculations

1047. Simple calculations

Time Limit: 1.0 second
Memory Limit: 16 MB

There is a sequence of N + 2 elements a₀, a₁, …, a_N+1 (1 ≤ N ≤ 3000, −2000 ≤ a_i ≤ 2000). It is known that

a_i = (a_i−1 + a_i+1)/2 − c_i

for each i = 1, 2, …, N.

You are given a₀, a_N+1, c₁, …, c_N. Write a program which calculates a₁.

Input

The first line contains an integer N. The next two lines consist of numbers a₀ and a_N+1 each having two digits after decimal point, and the next N lines contain numbers c_i (also with two digits after decimal point), one number per line.

Output

Output a₁ in the same format as a₀ and a_N+1.

Sample

input	output
1 50.50 25.50 10.15	27.85

Problem Author: Dmitry Filimonenkov
Problem Source: Ural State University collegiate programming contest (25.03.2000)

用數學方法推出公式即可：

//ural1047
//a1=( aN_1 +N*a0 -2*( (c1+……cN)+ (c1+……cN-1 ) +……(c1+c2)+(c1) ))/(N+1)
#include<iostream>
using namespace std;
double ci[3010]={0};  //ci[i]=c1+c2+……ci
int main()
{
   int N,i;
   double a0,aN_1,temp,sum=0;
   cin>>N>>a0>>aN_1;
   for(i=1; i<=N; i++)
   {
       cin>>temp;
       ci[i]=ci[i-1]+temp;
       sum+=ci[i];
   }

   sum*=2;

   cout.precision(2);
   cout<<fixed<<( aN_1+ N*a0 -sum)/(N+1)<<endl;

   system("pause");
    return 0;
}

posted on 2010-06-24 23:09 田兵閱讀(343) 評論(0) 編輯收藏引用所屬分類: URAL

只有注冊用戶登錄后才能發表評論。
【推薦】100%開源！大型工業跨平臺軟件C++源碼提供，建模，組態！

相關文章: Ural 1060 Flip Game Ural 1080 Map Colouring Ural 1008 Image encoding Ural 1047 Simple calculations Ural 1033 Labyrinth Ural 1044 Lucky tickets. Easy! Ural 題目分類【轉】 Ural 1025 Democracy in danger Ural 1020 Rope Ural 1017 The Staircases

網站導航: 博客園 IT新聞 BlogJava 博問 Chat2DB 管理

Ural 1047 Simple calculations

1047. Simple calculations

Input

Output

Sample

導航

統計

常用鏈接

留言簿(2)

隨筆分類(65)

隨筆檔案(65)

文章檔案(2)

ACM

搜索

積分與排名

最新隨筆

最新評論

閱讀排行榜