LeetCode 611. 有效三角形的个数(Valid Triangle Number)

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;
    }
}

相似题目

• 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/