​LeetCode刷题实战458：可怜的小猪

示例 1：
输入：buckets = 1000, minutesToDie = 15, minutesToTest = 60
输出：5

示例 2：
输入：buckets = 4, minutesToDie = 15, minutesToTest = 15
输出：2

示例 3：
输入：buckets = 4, minutesToDie = 15, minutesToTest = 30
输出：2

class Solution {
    public int poorPigs(int buckets, int minutesToDie, int minutesToTest) {
        
        if(buckets == 1) return 0;
        
        int w = minutesToTest / minutesToDie + 1;
        int re = 1;
        while(Math.pow(w,re) < buckets)
            re ++;
        
        return re;
    }
}