劍指offer34_醜數

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/***********************************************************************
*@time          2016/08/24 21:01
*@place         DHU.13.5005
*@description   得出第i個醜數
*************************************************************************/
#include<cstdio>
#include<stdlib.h>
#include<algorithm>
using namespace std;
int get_Ugly_Number(int* ugly_Numbers,int nth_Ugly_Number)
{
    ugly_Numbers[0]=1;
    int* ugly_Numbers2=ugly_Numbers;
    int* ugly_Numbers3=ugly_Numbers;
    int* ugly_Numbers5=ugly_Numbers;

    int index=1;
    while(index<nth_Ugly_Number)
    {
        int next_Ugly_Number=min(min(*ugly_Numbers2*2,*ugly_Numbers3*3),*ugly_Numbers5*5);
        ugly_Numbers[index]=next_Ugly_Number;

        while(*ugly_Numbers2*2<=next_Ugly_Number) ugly_Numbers2++;
        while(*ugly_Numbers3*3<=next_Ugly_Number) ugly_Numbers3++;
        while(*ugly_Numbers5*5<=next_Ugly_Number) ugly_Numbers5++;
        index++;
    }
    int result=ugly_Numbers[nth_Ugly_Number-1];
    return result;
}
int main()
{
    int max_Search_Index=-1;
    int nth_Ugly_Number;
    int* ugly_Numbers=NULL;
    while(scanf("%d",&nth_Ugly_Number))
    {
        if(nth_Ugly_Number<=max_Search_Index)
        {
            int ugly=ugly_Numbers[nth_Ugly_Number-1];
            printf("%d\n",ugly);
        }
        else
        {
            max_Search_Index=nth_Ugly_Number;
            delete[] ugly_Numbers;

            ugly_Numbers=new int[nth_Ugly_Number];

            int ugly=get_Ugly_Number(ugly_Numbers,nth_Ugly_Number);
            printf("%d\n",ugly);
        }
    }

}