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C++ leetcode(c# leetcode)

[LeetCode] 228.Summary Ranges 总结区间

Given a sorted integer array without duplicates, return the summary of its ranges.

Example 1:

Input: [0,1,2,4,5,7]
Output: ["0->2","4->5","7"]
Explanation: 0,1,2 form a continuous range;4,5 form a continuous range.

Example 2:

Input: [0,2,3,4,6,8,9]
Output: ["0","2->4","6","8->9"]
Explanation: 2,3,4 form a continuous range;8,9 form a continuous range.

Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.

这道题给定我们一个有序数组,让我们总结区间,具体来说就是让我们找出连续的序列,然后首尾两个数字之间用个“->"来连接,那么我只需遍历一遍数组即可,每次检查下一个数是不是递增的,如果是,则继续往下遍历,如果不是了,我们还要判断此时是一个数还是一个序列,一个数直接存入结果,序列的话要存入首尾数字和箭头“->"。我们需要两个变量i和j,其中i是连续序列起始数字的位置,j是连续数列的长度,当j为1时,说明只有一个数字,若大于1,则是一个连续序列,代码如下:

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 class Solution { public: vector<string> summaryRanges(vector<int>& nums) { vector<string> res; int i = 0, n = nums.size(); while (i < n) { int j = 1; while (i + j < n && (long)nums[i + j] - nums[i] == j) ++j; res.push_back(j <= 1 ? to_string(nums[i]) : to_string(nums[i]) + "->" + to_string(nums[i + j - 1])); i += j; } return res; } };

类似题目:

Missing Ranges

Data Stream as Disjoint Intervals

参考资料:

https://leetcode.com/problems/summary-ranges/

https://leetcode.com/problems/summary-ranges/discuss/63451/9-lines-c%2B%2B-0ms-solution

https://leetcode.com/problems/summary-ranges/discuss/63219/Accepted-JAVA-solution-easy-to-understand

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原文链接:https://www.cnblogs.com/grandyang/p/4603555.html

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