【LeetCode】 313. Super Ugly Number

Write a program to find the nth super ugly number.

Super ugly numbers are positive numbers whose all prime factors are in the given prime list primes of size k. For example, [1, 2, 4, 7, 8, 13, 14, 16, 19, 26, 28, 32] is the sequence of the first 12 super ugly numbers given primes = [2, 7, 13, 19] of size 4.

Note:
(1) 1 is a super ugly number for any given primes.
(2) The given numbers in primes are in ascending order.
(3) 0 < k ≤ 100, 0 < n ≤ 106, 0 < primes[i] < 1000.
(4) The nth super ugly number is guaranteed to fit in a 32-bit signed integer.

public class Solution {    public int nthSuperUglyNumber(int n, int[] primes) {        int[] res = new int[n];        int[] index = new int[primes.length];        int[] value = new int[primes.length];        Arrays.fill(value, 1);        int next = 1;        for (int i = 0; i < n; i++) {            res[i] = next;            next = Integer.MAX_VALUE;            for (int j = 0; j < primes.length; j++) {                if (value[j] == res[i]) {                    value[j] = res[index[j]++] * primes[j];                }                next = Math.min(next, value[j]);            }        }        return res[n - 1];    }}