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Problem: Valid Triangle Number

med
30 min
Explore how to determine the count of triplets in an integer array that can form valid triangle sides. Learn to apply sorting and search strategies to solve this problem efficiently, developing skills essential for coding interviews.

Statement

Given an array of integers, nums, determine the number of triplets of distinct indices (i, j, k) that can be selected from the array such that the values at those indices can form the sides of a valid triangle.

Return this count as the result.

Note: The triplet of indices is treated as an unordered combination, not a permutation. For example, indices (0, 1, 2) and (2, 1, 0) represent the same triplet and should be counted once.

Constraints:

  • 1<=1 <= nums.length <=1000<= 1000

  • 0<=0 <= nums[i] <=1000<= 1000

Tap here to switch tabs
Problem
Ask
Submissions

Problem: Valid Triangle Number

med
30 min
Explore how to determine the count of triplets in an integer array that can form valid triangle sides. Learn to apply sorting and search strategies to solve this problem efficiently, developing skills essential for coding interviews.

Statement

Given an array of integers, nums, determine the number of triplets of distinct indices (i, j, k) that can be selected from the array such that the values at those indices can form the sides of a valid triangle.

Return this count as the result.

Note: The triplet of indices is treated as an unordered combination, not a permutation. For example, indices (0, 1, 2) and (2, 1, 0) represent the same triplet and should be counted once.

Constraints:

  • 1<=1 <= nums.length <=1000<= 1000

  • 0<=0 <= nums[i] <=1000<= 1000