zoukankan      html  css  js  c++  java
  • POJ 1595 Prime Cuts

     
    Prime Cuts
    Time Limit: 1000MS   Memory Limit: 10000K
    Total Submissions: 8245   Accepted: 3151

    Description

    A prime number is a counting number (1, 2, 3, ...) that is evenly divisible only by 1 and itself. In this problem you are to write a program that will cut some number of prime numbers from the list of prime numbers between (and including) 1 and N. Your program will read in a number N; determine the list of prime numbers between 1 and N; and print the C*2 prime numbers from the center of the list if there are an even number of prime numbers or (C*2)-1 prime numbers from the center of the list if there are an odd number of prime numbers in the list.

    Input

    Each input set will be on a line by itself and will consist of 2 numbers. The first number (1 <= N <= 1000) is the maximum number in the complete list of prime numbers between 1 and N. The second number (1 <= C <= N) defines the C*2 prime numbers to be printed from the center of the list if the length of the list is even; or the (C*2)-1 numbers to be printed from the center of the list if the length of the list is odd.

    Output

    For each input set, you should print the number N beginning in column 1 followed by a space, then by the number C, then by a colon (:), and then by the center numbers from the list of prime numbers as defined above. If the size of the center list exceeds the limits of the list of prime numbers between 1 and N, the list of prime numbers between 1 and N (inclusive) should be printed. Each number from the center of the list should be preceded by exactly one blank. Each line of output should be followed by a blank line. Hence, your output should follow the exact format shown in the sample output.

    Sample Input

    21 2
    18 2
    18 18
    100 7

    Sample Output

    21 2: 5 7 11
    
    18 2: 3 5 7 11
    
    18 18: 1 2 3 5 7 11 13 17
    
    100 7: 13 17 19 23 29 31 37 41 43 47 53 59 61 67
    

    Source

    // N 以内的素数列,从中间为标准,视情况(C)输出素数
    #include
    <iostream> #include <stdio.h> #include <algorithm> #include <string.h> using namespace std; bool b[1003]; void pri() { int a[13]={2,3,5,7,11,13,17,19,23,29,31}; int i,j; for(i=0;i<11;i++) for(j=a[i]*2;j<=1000;j+=a[i]) b[j]=1; } int r[300]; int re[1003]; int main() { pri(); int i=1,j=0; for(i=1;i<=1000;i++) if(!b[i]) { r[j++]=i; re[i]=re[i-1]+1; } else re[i]=re[i-1]; int N,C; int c,m; while(scanf("%d%d",&N,&C)!=EOF) { printf("%d %d:",N,C); c=C*2; if(re[N]%2) c--; if(c>=re[N]) { for(i=0;i<re[N];i++) printf(" %d",r[i]); printf("\n\n");continue; } m=re[N]/2; if(re[N]%2) { m++;m-=C; for(i=0;i<c;i++) printf(" %d",r[m++]); } else { m-=C; for(i=0;i<c;i++) printf(" %d",r[m++]); } printf("\n\n"); } return 0; }
  • 相关阅读:
    ASP.NET存储过程自定义分页详解
    ajax php POST 提交例子
    一个用存储过程的基本分页及其调用
    DataGrid 存储过程的分页
    无刷新无限级菜单联动
    asp.net URL多参数傳值以及特殊符号传值问题
    ASP.NET页面间参数的传递
    Android动画开发——Animation动画效果
    android surface
    Android控件属性——android:cacheColorHint=“#00000000”
  • 原文地址:https://www.cnblogs.com/372465774y/p/2578606.html
Copyright © 2011-2022 走看看