NYOJ题目611练练

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" alt="" />

-------------------------------

这道题是有技巧的，比如：

2+4+6+8...+n

= 2*1 + 2*2 + 2*3 + 2*4 + ... + 2*(n/2)

= 2* （1+2+3+4...+(n/2)）

=2 * ( (n/2)*(1+n/2)/2) 即d为1的等差数列和公式，因为复杂的公式我记不住...

=(n/2)*(1+n/2)

别问我为什么这么2b，因为我数学是体育老师教的还都还回去了了....

只好百度等差数列公式：

嗯，至少应用在这个题上这个还不如我胡乱发明的简便吶，所以也就不改动代码了，不管黑猫白猫，能抓老鼠就是好吃的猫。

AC代码：

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;

 public class Main {

     public static void main(String[] args) throws NumberFormatException, IOException {

         BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));

         boolean first=true;

         while(first || reader.ready()){
             first=false;

             int n=Integer.parseInt(reader.readLine());

             n=n%==?n:n-;

             System.out.println((n/)*(+n/));

         }

     }

 }

题目来源： http://acm.nyist.net/JudgeOnline/problem.php?pid=611