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Leetcode练习(Python):数组类:第57题:给出一个无重叠的 ,按照区间起始端点排序的区间列表。 在列表中插入一个新的区间,你需要确保列表中的区间仍然有序且不重叠(如果有必要的话,可以合并区间)。

时间:2020-04-20 22:00:48      阅读:124      评论:0      收藏:0      [点我收藏+]

标签:new   简单   bsp   als   data   iar   python   append   sel   

题目:

给出一个无重叠的 ,按照区间起始端点排序的区间列表。

在列表中插入一个新的区间,你需要确保列表中的区间仍然有序且不重叠(如果有必要的话,可以合并区间)。

思路:开始使用纯逻辑的思路,使用了大量的判断,如程序2所示,可以通过题目的两个例子,但是在自创例子时出现了超时的提示(要把复杂的问题简单化)。看了一个大神的程序,然后模仿了下来,如程序1,写的很精巧。

程序1:

class Solution:
    def insert(self, intervals: List[List[int]], newInterval: List[int]) -> List[List[int]]:
        intervals.sort(key = lambda data : data[0])
        length = len(intervals)
        index = 0
        auxiliary_index = 0
        while index < length:
            if newInterval[1] < intervals[index][0]:
                break
            elif newInterval[0] > intervals[index][1]:
                pass
            else:
                newInterval[0] = min(newInterval[0], intervals[index][0])
                newInterval[1] = max(newInterval[1], intervals[index][1])
                auxiliary_index += 1
            index += 1
        if auxiliary_index > 0:
            intervals = intervals[: index - auxiliary_index] + intervals[index :]
        intervals.insert(index - auxiliary_index, newInterval) 
        return intervals
 
程序2:
class Solution:
    def insert(self, intervals: List[List[int]], newInterval: List[int]) -> List[List[int]]:
        intervals.sort(key = lambda data : data[0])
        length = len(intervals)
        if length <= 0:
            return [newInterval]
        if length == 1:
            if intervals[0][1] >= newInterval[0] and intervals[0][1] <= newInterval[1]:
                temp = []
                left = min(intervals[0][0], newInterval[0])
                temp.append(left)
                right = max(intervals[0][1], newInterval[1])
                temp.append(right)
                return [temp]
            elif intervals[0][1] < newInterval[0]:
                temp_1 = []
                left = intervals[0][0]
                temp_1.append(left)
                right = intervals[0][1]
                temp_1.append(right)
                temp_2 = []
                left = newInterval[0]
                temp_2.append(left)
                right = newInterval[1]
                temp_2.append(right)
                result = []
                result.append(temp_1)
                result.append(temp_2)
                return result
            elif intervals[0][0] > newInterval[1]:
                temp_3 = []
                left = newInterval[0]
                temp_3.append(left)
                right = newInterval[1]
                temp_3.append(right)
                temp_4 = []
                left = intervals[0][0]
                temp_4.append(left)
                right = intervals[0][1]
                temp_4.append(right)
                result_1 = []
                result_1.append(temp_3)
                result_1.append(temp_4)
                return result_1
            elif intervals[0][0] >= newInterval[0] and intervals[0][1] > newInterval[1]:
                temp_5 = []
                left = min(intervals[0][0], newInterval[0])
                temp_5.append(left)
                right = max(intervals[0][1], newInterval[1])
                temp_5.append(right)
                return [temp_5]
        index = 1
        while index < len(intervals):
            if newInterval[0] >= intervals[index - 1][0] and newInterval[0] < intervals[index - 1][1]:
                if newInterval[1] >= intervals[index - 1][1] and newInterval[1] < intervals[index][0]:
                    intervals[index - 1][0] = intervals[index - 1][0]
                    intervals[index - 1][1] = newInterval[1]
                elif newInterval[1] <= intervals[index - 1][1]:
                    intervals[index - 1][0] = intervals[index - 1][0]
                    intervals[index - 1][1] = intervals[index - 1][1]
                elif intervals[index][0] <= newInterval[1] and newInterval[1] < intervals[index][1]:
                    intervals[index - 1][0] = intervals[index - 1][0]
                    intervals[index - 1][1] = intervals[index][1]
                elif newInterval[1] >= intervals[index][1]:
                    del intervals[index]
                    intervals[index - 1][0] = intervals[index - 1][0]
                    intervals[index - 1][1] = newInterval[1]
                    #del intervals[index]
            elif newInterval[0] > intervals[index - 1][0] and newInterval[0] <= intervals[index - 1][1]:
                if newInterval[1] >= intervals[index - 1][1] and newInterval[1] < intervals[index][0]:
                    intervals[index - 1][0] = intervals[index - 1][0]
                    intervals[index - 1][1] = newInterval[1]
                elif newInterval[1] <= intervals[index - 1][1]:
                    intervals[index - 1][0] = intervals[index - 1][0]
                    intervals[index - 1][1] = intervals[index - 1][1]
                elif intervals[index][0] <= newInterval[1] and newInterval[1] < intervals[index][1]:
                    intervals[index - 1][0] = intervals[index - 1][0]
                    intervals[index - 1][1] = intervals[index][1]
                elif newInterval[1] >= intervals[index][1]:
                    del intervals[index]
                    intervals[index - 1][0] = intervals[index - 1][0]
                    intervals[index - 1][1] = newInterval[1]
            elif newInterval[1] < intervals[index - 1][0]: 
                intervals.insert(index - 1, newInterval)
            elif newInterval[0] > intervals[index - 1][1]:
                if newInterval[1] < intervals[index][0]:
                    intervals.insert(index, newInterval)
                elif newInterval[1] >= intervals[index][0] and newInterval[1] < intervals[index][1]:
                    #del intervals[index]
                    intervals[index][0] = intervals[index][0]
                    intervals[index][1] = newInterval[1]
                elif newInterval[1] >= intervals[index][0] and newInterval[1] >= intervals[index][1]:
                    #del intervals[index]
                    intervals[index][0] = intervals[index][0]
                    intervals[index][1] = newInterval[1]
            elif newInterval[0] < intervals[index - 1][1]:
                if newInterval[1] <= intervals[index - 1][1]:
                    intervals[index - 1][0] = newInterval[0]
                    intervals[index - 1][1] = intervals[index - 1][1]
                elif newInterval[1] > intervals[index - 1][1] and newInterval[1] < intervals[index][0]:
                    intervals[index - 1][0] = newInterval[0]
                    intervals[index - 1][1] = intervals[index - 1][1]
                elif newInterval[1] > intervals[index - 1][1] and newInterval[1] >= intervals[index][0]:
                    if newInterval[1] < intervals[index][1]:
                        intervals[index - 1][0] = newInterval[0]
                        intervals[index - 1][1] = intervals[index][1]
                    else:
                        intervals[index - 1][0] = newInterval[0]
                        intervals[index - 1][1] = newInterval[1]
            index += 1
        index_1 = 1
        while index_1 < len(intervals):
            if intervals[index_1][0] <= intervals[index_1 - 1][1]:
                intervals[index_1 - 1][1] = max(intervals[index_1 - 1][1], intervals[index_1][1])
                del intervals[index_1]
            else:
                index_1 += 1
        return intervals

Leetcode练习(Python):数组类:第57题:给出一个无重叠的 ,按照区间起始端点排序的区间列表。 在列表中插入一个新的区间,你需要确保列表中的区间仍然有序且不重叠(如果有必要的话,可以合并区间)。

标签:new   简单   bsp   als   data   iar   python   append   sel   

原文地址:https://www.cnblogs.com/zhuozige/p/12740361.html

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