Jan's LightOJ :: Problem 1045 - Digits of Factorial

Jan's LightOJ :: Problem 1045 - Digits of Factorial

E - E 使用long long

Time Limit:2000MS     Memory Limit:32768KB     64bit IO Format:%lld & %llu

Submit Status Practice LightOJ 1045 uDebug

Description

Factorial of an integer is defined by the following function

f(0) = 1

f(n) = f(n - 1) * n, if(n > 0)

So, factorial of 5 is 120. But in different bases, the factorial may be different. For example, factorial of 5 in base 8 is 170.

In this problem, you have to find the number of digit(s) of the factorial of an integer in a certain base.

Input

Input starts with an integer T (≤ 50000), denoting the number of test cases.

Each case begins with two integers n (0 ≤ n ≤ 10⁶) and base (2 ≤ base ≤ 1000). Both of these integers will be given in decimal.

Output

For each case of input you have to print the case number and the digit(s) of factorial n in the given base.

Sample Input

5

5 10

8 10

22 3

1000000 2

0 100

Sample Output

Case 1: 3

Case 2: 5

Case 3: 45

Case 4: 18488885

Case 5: 1

#include<iostream>#include<stdio.h>#include<cmath>using namespace std;double logg[1000001];int main(){int t, n, base;cin >> t;logg[0] = 0;for (int i = 1; i < 1000001; i++)logg[i] += logg[i - 1] + log(i);for (int i = 1; i <= t; i++){scanf("%d%d", &n, &base);printf("Case %d: %d\n", i, int(logg[n]/log(base)) + 1);}return 0;}