57. Insert Interval

description:

插入新的区间，涉及到区间的合并.
Note:

Example:

Example 1:

Input: intervals = [[1,3],[6,9]], newInterval = [2,5]
Output: [[1,5],[6,9]]

Example 2:

Input: intervals = [[1,2],[3,5],[6,7],[8,10],[12,16]], newInterval = [4,8]
Output: [[1,2],[3,10],[12,16]]
Explanation: Because the new interval [4,8] overlaps with [3,5],[6,7],[8,10].

answer:

class Solution {
public:
    vector<vector<int>> insert(vector<vector<int>>& intervals, vector<int>& newInterval) {
        int n = intervals.size(), cur = 0;
        vector<vector<int>> res;
        while (cur < n && intervals[cur][1] < newInterval[0]) {
            res.push_back(intervals[cur++]);
        }
        while (cur < n && intervals[cur][0] <= newInterval[1]) {
            newInterval[0] = min(newInterval[0], intervals[cur][0]);
            newInterval[1] = max(newInterval[1], intervals[cur][1]);
            ++cur;
        }
        res.push_back(newInterval);
        while (cur < n) {
            res.push_back(intervals[cur++]);
        }
        return res;
    }
};

relative point get√：

hint :

第一个循环把不和给定新区间重叠的，应该放在新区间前面的区间先放在答案里
第二个循环处理有重叠的部分，一直到后边最后一个没有重叠了退出
最后一个循环将新区间后边的没有重叠的放到答案里