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- public class Solution {
- /**
- * @param nums an array of integer
- * @param target an integer
- * @return an integer
- */
- public int twoSum5(int[] nums, int target) {
- // Write your code here
- if (nums == null || nums.length < 2)
- return 0;
- Arrays.sort(nums);
- int cnt = 0;
- int left = 0, right = nums.length - 1;
- while (left < right) {
- int v = nums[left] + nums[right];
- if (v > target) {
- right --;
- } else {
- cnt += right - left;
- left ++;
- }
- }
- return cnt;
- }
- }
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