codeforce 483C

C. Finite or not?
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output

You are given several queries. Each query consists of three integers ppqq and bb. You need to answer whether the result of p/qp/q in notation with base bb is a finite fraction.

A fraction in notation with base bb 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 nn (1n1051≤n≤105) — the number of queries.

Next nn lines contain queries, one per line. Each line contains three integers ppqq, and bb (0p10180≤p≤10181q10181≤q≤10182b10182≤b≤1018). All numbers are given in notation with base 1010.

Output

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

Examples
input
Copy
2
6 12 10
4 3 10
output
Copy
Finite
Infinite
input
Copy
4
1 1 2
9 36 2
4 12 3
3 5 4
output
Copy
Finite
Finite
Finite
Infinite
Note

612=12=0,510612=12=0,510

43=1,(3)1043=1,(3)10

936=14=0,012936=14=0,012

412=13=0,13

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<iostream>
#include<string.h>
#include<algorithm>
#include<cmath>
#include<map>
#include<string>
#include<stdio.h>
#include<vector>
#include<string>
#include<time.h>
#include<stack>
using namespace std;
#define LL long long int
#define mod 1000000007
#define MAX(x, y) (x) > (y) ? (x) : (y)
using namespace std;
int n;
int m;
int dir[8][2] = { 1,0,0,1,-1,0,0,-1,1,1,-1,1,1,-1,-1 ,-1 };

LL gcd(LL a, LL b) {
	return b == 0 ? a : gcd(b, a%b);
}
int main()
{
	ios::sync_with_stdio(false);
	int n;
	LL a, b, c;
	cin >> n;
	while (n--) {
		cin >> a >> b >> c;
		LL g = gcd(a, b);
		a /= g;
		b /= g;
		while (b != 1 && c != 1) {
			c = gcd(b, c);
			b /= c;
		}
			if (b==1) {
				cout << "Finite" << endl;
			}
			else {
				cout << "Infinite" << endl;
			}
	}
	return 0;
}


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转载自blog.csdn.net/swust_zeng_zhuo_k/article/details/80572084