259. 3Sum Smaller

class Solution {
    public int threeSumSmaller(int[] nums, int target) {
        if (nums.length <= 2) {
            return 0;
        }

        Arrays.sort(nums);
        int count = 0;
        for (int i = 0; i < nums.length; i++) {
            int left = i + 1;
            int right = nums.length - 1;
            while (left < right) {  
                int sum = nums[i] + nums[left] + nums[right];
                if (sum < target) {
                    count += right - left;
                    left++;
                } else {
                    right--;
                }
            }
        }

        return count;
    }
}