数论：zoj 2829 Beautiful Number

【转】http://blog.youkuaiyun.com/zxy_snow/article/details/6007526

 

#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <string.h>
using namespace std;
int num[220000];
int ind[100001];
int main(void)
{
	int n;
	memset(num,0,sizeof(num));
	for(int k=1; k*3<220000; k++)
		num[k*3] = 1;
	for(int k=1; k*5<220000; k++)
		num[k*5] = 1;
	int k=1;
	for(int i=1; i<220000; i++)
	{
		if( num[i] == 1 )
			ind[k++] = i;
	}
	while( scanf("%d",&n)!=EOF )
	{
		printf("%d/n",ind[n]);	
	}	
return 0;
}