【leetcode】986. Interval List Intersections
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]
(witha <= b
) denotes the set of real numbersx
witha <= 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
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