题目:http://acm.timus.ru/problem.aspx?space=1&num=1748 题意:求n范围内约数个数最多的那个数. Roughly speaking, for a number to be highly composite it has to have prime factors as small as possible, but not too many of the same. If we decompose a number n in prime factor…
Write a program to check whether a given number is an ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7. Note that 1 is ty…
丑数系列的题看这一道就可以了 /* 和ugly number2差不多,不过这次的质因子多了,所以用数组来表示质因子的target坐标 target坐标指的是这个质因子此次要乘的前任丑数是谁 */ public int nthSuperUglyNumber(int n, int[] primes) { //记录相乘坐标,存的是每个质因子对应相乘搭档在丑数数组中的下标 int[] target = new int[primes.length]; //动态规划数组 int[] dp = new int…
题目: Write a program to check whether a given number is an ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7. Note that 1 i…