【leetcode】986. Interval List Intersections

标签：ted   real   output   复杂度   cti   interval   leetcode   cts   elf   

题目如下：

Given two lists of closed intervals, each list of intervals is pairwise disjoint and in sorted order.

Return the intersection of these two interval lists.

(Formally, a closed interval [a, b] (with a <= b) denotes the set of real numbers x with a <= x <= b.  The intersection of two closed intervals is a set of real numbers that is either empty, or can be represented as a closed interval.  For example, the intersection of [1, 3] and [2, 4] is [2, 3].)

 

Example 1:

Input: A = [[0,2],[5,10],[13,23],[24,25]], B = [[1,5],[8,12],[15,24],[25,26]]
Output: [[1,2],[5,5],[8,10],[15,23],[24,24],[25,25]]
Reminder: The inputs and the desired output are lists of Interval objects, and not arrays or lists.

解题思路：因为A与B的最大长度是1000，因此O(n^2)的时间复杂度是可以接受的。依次比较A与B中的所有元素，求出交集即可。

代码如下：

# Definition for an interval.
class Interval(object):
    def __init__(self, s=0, e=0):
        self.start = s
        self.end = e

class Solution(object):
    def intervalIntersection(self, A, B):
        """
        :type A: List[Interval]
        :type B: List[Interval]
        :rtype: List[Interval]
        """
        res = []
        for a in A:
            for b in B:
                if a.end < b.start:
                    break
                elif a.start > b.end:
                    continue
                else:
                    res.append(Interval(max(a.start,b.start),min(a.end,b.end)))
        return res

【leetcode】986. Interval List Intersections

标签：ted   real   output   复杂度   cti   interval   leetcode   cts   elf   

原文地址：https://www.cnblogs.com/seyjs/p/10351205.html