[LeetCode]611. Valid Triangle Number
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https://leetcode.com/problems/valid-triangle-number/#/description
找出满足组成三角形的三条边的个数
组成三角形条件是两条较短的边的和大于第三条边
public class Solution { public int triangleNumber(int[] nums) { if (nums == null || nums.length < 3) { return 0; } Arrays.sort(nums); int cnt = 0; for (int i = nums.length - 1; i >= 2; i--) { int l = 0; int r = i - 1; while (l < r) { if (nums[l] + nums[r] > nums[i]) { cnt += r - l; r--; } else { l++; } } } return cnt; }}阅读全文
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