problem0646

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Published: Sep 11, 2020 License: MIT Imports: 1 Imported by: 0

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646. Maximum Length of Pair Chain

题目

You are given n pairs of numbers. In every pair, the first number is always smaller than the second number.

Now, we define a pair (c, d) can follow another pair (a, b) if and only if b < c. Chain of pairs can be formed in this fashion.

Given a set of pairs, find the length longest chain which can be formed. You needn't use up all the given pairs. You can select pairs in any order.

Example 1:

Input: [[1,2], [2,3], [3,4]]
Output: 2
Explanation: The longest chain is [1,2] -> [3,4]

Note: The number of given pairs will be in the range [1, 1000].

解题思路

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