Hdu 1016 Prime Ring Problem
2014-01-24 20:59
309 查看
import java.io.*; import java.math.BigInteger; import java.util.*; public class stackingbox { public static int[] primer_table = new int[50]; public static int[] mark = new int[22]; public static StringBuilder sb = new StringBuilder(); public static void DFS(int n, int now, int[] result, int count){ if(count==n){ if(primer_table[1+result[n-1]]==1){ for(int i=0;i<n-1;i++){ sb.append(result[i]).append(" "); } sb.append(result[n-1]+"\r\n"); } return; } for(int i=2;i<=n;i++){ if(mark[i]==1) continue; if(primer_table[i+now]==1){ mark[i]=1; result[count]=i; DFS(n, i, result, count+1); result[count]=0; mark[i]=0; } } } public static void main (String [] args) throws Exception { Scanner scan = new Scanner(System.in); for(int i=2;i<50;i++){ int flag = 1; for(int j=2;j<=Math.sqrt(i);j++){ if(i%j==0) flag=0; } primer_table[i] = flag; } int count = 1; while(scan.hasNextInt()){ sb = new StringBuilder(); sb.append("Case ").append(count).append(":").append("\r\n"); int n = scan.nextInt(); Arrays.fill(mark, 0); mark[1] = 1; int[] result = new int[22]; result[0] = 1; DFS(n, 1, result, 1); count++; sb.append("\r\n"); System.out.print(sb.toString()); //System.out.println(); } } }
不是什么难题 但是有点坑到我了。
发一下记住一些教训。。
1.这个输出太多,我用system.out输出妥妥TLE, 结果害我想了2钟头怎么优化剪枝。。艹
好吧我是傻叉,java写了这么多年,我知道输入多会出问题,没碰过输出多也TLE的。哎
2.然后PE到死又调了一个钟头,行尾空格,空白行都查过了。
哪知道这里用system.out.println 又或者\n 都会PE, 非得\r\n才能过,几个意思啊
还是赶快转C算了,搞出这么多事,C的printf("\n")就不出出错
3.最后吐槽hdu貌似只算第一次提交的速度。我最快的一次俨然超过了java的统计最快但是没上榜=。=
相关文章推荐
- hdu 1016 Prime Ring Problem
- HDOJ 1016 HDU 1016 Prime Ring Problem ACM 1016 IN HDU
- HDU 1016 Prime Ring Problem 深搜
- hdu 1016 Prime Ring Problem
- HDU——1016 Prime Ring Problem
- HDU 1016 Prime Ring Problem (素数环)(DFS)
- HDU-1016- Prime Ring Problem
- HDU 1016 Prime Ring Problem(搜索入门题 DFS,多种方式)
- Hdu 1016 Prime Ring Problem (素数环经典dfs)
- HDU 1016--Prime Ring Problem【DFS】
- hdu 1016 Prime Ring Problem (dfs)
- HDU 1016 Prime Ring Problem
- HDU 1016 Prime Ring Problem【DFS】
- 搜索——Hdu_1016_Prime Ring Problem
- HDU 1016 Prime Ring Problem
- HDU 1016 Prime Ring Problem
- HDU-1016 Prime Ring Problem
- HDU 1016 Prime Ring Problem
- HDU 1016 Prime Ring Problem
- HDU 1016 Prime Ring Problem(DFS)