LeetCode 264
动态规划
参考官方题解：
|——https://leetcode-cn.com/problems/ugly-number-ii/solution/chou-shu-ii-by-leetcode-solution-uoqd/
public class Solution {
public int nthUglyNumber(int n) {
int[] dp = new int[n + 1];
dp[1] = 1;
int p2 = 1, p3 = 1, p5 = 1;
for (int i = 2; i <= n; i++) {
int num2 = dp[p2] * 2, num3 = dp[p3] * 3, num5 = dp[p5] * 5;
dp[i] = Math.min(Math.min(num2, num3), num5);
if (dp[i] == num2) p2++;
if (dp[i] == num3) p3++;
if (dp[i] == num5) p5++;
}
return dp[n];
}
}
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