611. 有效三角形的个数

611. Valid Triangle Number

题目描述

LeetCode

LeetCode

LeetCode611. Valid Triangle Number中等

Java 实现

import java.util.Arrays;

class Solution {

    public int triangleNumber(int[] nums) {

        int count = 0, len = nums.length;

        Arrays.sort(nums);

        for (int i = len - 1; i > 1; i--) {

            int left = 0, right = i - 1;

            while (left < right) {

                if (nums[left] + nums[right] > nums[i]) {

                    count += right - left;

                    right--;

                } else {

                    left++;

                }

            }

        }

        return count;

    }

}

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• 259. 较小的三数之和 3Sum Smaller

参考资料

• https://leetcode-cn.com/problems/valid-triangle-number/
• https://leetcode.com/problems/valid-triangle-number/