poj2247

同1338

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
using namespace std;

#define maxn 6000
#define inf 0x3f3f3f3f

long long f[maxn];
int pos[4], fac[4];

char* make(int a, char *st)
{
    if (a % 10 == 1 && a % 100 != 11)
        strcpy(st, "st");
    else if (a % 10 == 2 && a % 100 != 12)
        strcpy(st, "nd");
    else if (a % 10 == 3 && a % 100 != 13)
        strcpy(st, "rd");
    else
        strcpy(st, "th");
    return st;
}

int main()
{
//    freopen("t.txt", "r", stdin);
    f[1] = 1;
    pos[0] = pos[1] = pos[2] = pos[3] = 1;
    fac[0] = 2;
    fac[1] = 3;
    fac[2] = 5;
    fac[3] = 7;
    for (int i = 2; i <= 5842; i++)
    {
        f[i] = -1;
        for (int j = 0; j < 4; j++)
            if (f[pos[j]] * fac[j] < f[i] || f[i] == -1)
                f[i] = f[pos[j]] * fac[j];
        for (int j = 0; j < 4; j++)
            if (f[pos[j]] * fac[j] <= f[i])
                pos[j]++;
    }
    int n;
    char st[3];
    while (scanf("%d", &n), n)
        printf("The %d%s humble number is %lld.\n", n, make(n, st), f[n]);
    return 0;
}