Codeforces 114A-Cifera（暴力）

A. Cifera

time limit per test

2 seconds

memory limit per test

256 megabytes

input

standard input

output

standard output

When Petya went to school, he got interested in large numbers and what they were called in ancient times. For instance, he learned that the Russian word "tma" (which now means "too much to be counted") used to stand for a thousand and "tma tmyschaya" (which
literally means "the tma of tmas") used to stand for a million.

Petya wanted to modernize the words we use for numbers and invented a word petricium that represents number k.
Moreover,petricium la petricium stands for number k2, petricium
la petricium la petricium stands for k3 and
so on. All numbers of this form are called petriciumus cifera, and the number's importance is the number of articles la in
its title.

Petya's invention brought on a challenge that needed to be solved quickly: does some number l belong to the set petriciumus
cifera?

As Petya is a very busy schoolboy he needs to automate the process, he asked you to solve it.

Input

The first input line contains integer number k, the second line contains integer number l (2 ≤ k, l ≤ 231 - 1).

Output

You should print in the first line of the output "YES", if the number belongs to the set petriciumus
cifera and otherwise print "NO". If the number belongs to the set, then print on the seconds line the only number — the importance of number l.

Sample test(s)

input

5
25

output

YES
1

input

3
8

output

NO

Div2 A题。。
 
没什么好说的。
 
非常水

题意： 给k l，问l是否等于 k^n  (n=1,2,3.....)注意：不要用pow()函数。。会有精度损失的

#include <iostream>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <vector>
#include <queue>
#include <set>
#include <cmath>
#include <stack>
#define ll long long
using namespace std;
const int INF=0x3f3f3f3f;
int l,k;
ll my_pow(int a,int n)
{
	ll ans=1;
	for(int i=1;i<=n;i++)
		ans*=a;
	return ans;
}
void solve()
{
	if(k==l)
	{
		puts("YES");
		puts("0");
		return ;
	}
	int t=1,flag=0;
	while(1)
	{
		if(l==my_pow(k,t+1))
		{
			flag=1;
			break;
		}
		else if(l<my_pow(k,t+1))
		{
			break;
		}
		t++;
	}
	if(flag)
	{
		puts("YES");
		printf("%d\n",t);
	}
	else
	puts("NO");
}
int main()
{
    while(~scanf("%d%d",&k,&l))
		solve();
	return 0;
}