J -?數論，質因數分解 Time Limit:1000MS?????Memory Limit:32768KB?????64bit IO Format:%I64d & %I64u Submit?Status

Description

Tomorrow is contest day, Are you all ready??
We have been training for 45 days, and all guys must be tired.But , you are so lucky comparing with many excellent boys who have no chance to attend the Province-Final.?

Now, your task is relaxing yourself and making the last practice. I guess that at least there are 2 problems which are easier than this problem.?
what does this problem describe??
Give you a positive integer, please split it to some prime numbers, and you can got it through sample input and sample output.?

Input

Input file contains multiple test case, each case consists of a positive integer n(1<n<65536), one per line. a negative terminates the input, and it should not to be processed.

Output

For each test case you should output its factor as sample output (prime factor must come forth ascending ), there is a blank line between outputs.

Sample Input

60 12 -1

Sample Output

Case 1. 2 2 3 1 5 1 Case 2. 2 2 3 1

Hint

60=2^2*3^1*5^1

解題思路：
這個題目很簡單，但是要注意一個陷井，就是輸入一個數的時候，它的結束條件是負數，一定要注意
程序代碼： #include <cstdio> #include <cstring> using namespace std; int b[66550]; int n; void p( ) {int m=n;while(1){for(int i=2;i<=n;i++ )if(m%i==0){b[i]++;m/=i;break;}if(m==1)break;}} int main() {int Case=0;while(scanf("%d",&n)==1&&n>0){if(Case>0) printf("\n");memset(b,0,sizeof(b));p();printf("Case %d.\n",++Case);for(int i=2;i<=n;i++)if(b[i]!=0)printf("%d %d ",i,b[i]);printf("\n");} } View Code

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轉載于:https://www.cnblogs.com/www-cnxcy-com/p/4750476.html

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