CF-Codeforces Round #483 (Div. 2) C. Finite or not? 数论

时间:2022-08-25 05:15:45

You are given several queries. Each query consists of three integers p, q and b. You need to answer whether the result of p/q in notation with base b

is a finite fraction.

A fraction in notation with base b

is finite if it contains finite number of numerals after the decimal point. It is also possible that a fraction has zero numerals after the decimal point.

Input

The first line contains a single integer n

( 1n105

) — the number of queries.

Next n

lines contain queries, one per line. Each line contains three integers p, q, and b ( 0p1018, 1q1018, 2b1018). All numbers are given in notation with base 10

.

Output

For each question, in a separate line, print Finite if the fraction is finite and Infinite otherwise.

Examples
Input
2
6 12 10
4 3 10
Output
Finite
Infinite
Input
4
1 1 2
9 36 2
4 12 3
3 5 4
Output
Finite
Finite
Finite
Infinite
Note

612=12=0,510

43=1,(3)10

936=14=0,012

412=13=0,13

真的是菜鸡啊啊啊啊啊啊

判断p/q在b进制下是否为有限小数。

若q中含有与b互素的因子,则无限循环。反之,则当k足够大时,b^k会是q的倍数,则为有限小数。


#include<stdio.h>

int n;
__int64 a,b,c,s,t;

__int64 get_gcd(__int64 u,__int64 v)
{
    if(v==0) return u;
    return get_gcd(v,u%v);
}

int main()
{
    while(~scanf("%d",&n))
    {
        while(n--)
        {
            scanf("%I64d%I64d%I64d",&a,&b,&c);
            s=get_gcd(a,b);
            a/=s;
            b/=s;
            while(b!=1 && c!=1)
            {
                c=get_gcd(b,c);
                b/=c;
            }
            if(b==1) printf("Finite\n");
            else printf("Infinite\n");
        }
    }
    return 0;
}