0413 Arithmetic Slices

Question

My Solution:

class Solution {
    public int numberOfArithmeticSlices(int[] nums) {
        int res = 0;
        int dp[] = new int[nums.length];

        for(int i = 2; i < nums.length; i++){
            if(nums[i] - nums[i-1] == nums[i-1] - nums[i-2]){
                dp[i] = dp[i-1] + 1;
                res += dp[i];
            }
        }
        return res;
    }
}