• Home
• com.github.javadev
• leetcode-in-java
• 1.7
• source code
• Solution.java

×

Project download

Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance.
Project price only 1 $

You can buy this project and download/modify it how often you want.

g0201_0300.s0264_ugly_number_ii.Solution Maven / Gradle / Ivy

package g0201_0300.s0264_ugly_number_ii;

// #Medium #Dynamic_Programming #Hash_Table #Math #Heap_Priority_Queue

public class Solution {
    public int nthUglyNumber(int n) {
        int[] ugly = new int[n];
        int i2 = 0;
        int i3 = 0;
        int i5 = 0;
        int ugly2 = 2;
        int ugly3 = 3;
        int ugly5 = 5;
        int nextugly;
        ugly[0] = 1;
        for (int i = 1; i < n; i++) {
            nextugly = Math.min(Math.min(ugly2, ugly3), ugly5);
            ugly[i] = nextugly;
            if (nextugly == ugly2) {
                i2++;
                ugly2 = ugly[i2] * 2;
            }
            if (nextugly == ugly3) {
                i3++;
                ugly3 = ugly[i3] * 3;
            }
            if (nextugly == ugly5) {
                i5++;
                ugly5 = ugly[i5] * 5;
            }
        }
        return ugly[n - 1];
    }
}