src/main/java/com/fishercoder/solutions/_276.java

package com.fishercoder.solutions;

public class _276 {
    public static class Solution1 {
        public int numWays(int n, int k) {
            if (n == 0) {
                return 0;
            } else if (n == 1) {
                return k;
            }
            int sameColorCnt = k;
            int diffColorCnt = k * (k - 1);
            for (int i = 2; i < n; i++) {
                int temp = diffColorCnt;
                diffColorCnt = (diffColorCnt + sameColorCnt) * (k - 1);
                sameColorCnt = temp;
            }
            return sameColorCnt + diffColorCnt;
        }
    }
}