Insert Interval [leetcode]

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本文介绍了一种算法，用于将新区间插入到一组不重叠区间中，并在必要时进行合并。算法假定初始区间已按开始时间排序。

Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary).

You may assume that the intervals were initially sorted according to their start times.

Example 1:
Given intervals [1,3],[6,9], insert and merge [2,5] in as [1,5],[6,9].

Example 2:
Given [1,2],[3,5],[6,7],[8,10],[12,16], insert and merge [4,9] in as [1,2],[3,10],[12,16].

This is because the new interval [4,9] overlaps with [3,5],[6,7],[8,10].

vector<Interval> insert(vector<Interval> &intervals, Interval newInterval) {
        int start = 0, end = 0;
        for (; start < intervals.size() && intervals[start].end < newInterval.start; start++);
        for (end = start; end < intervals.size() && intervals[end].start <= newInterval.end; end++);
        end--;
        if (start <= end && start < intervals.size())
        {
            intervals[start].start = min(intervals[start].start, newInterval.start);
            intervals[start].end = max(intervals[end].end, newInterval.end);
            if (start < end)
                intervals.erase(intervals.begin() + start + 1, intervals.begin() + end + 1);
        }
        else
            intervals.insert(intervals.begin() + start, newInterval);
        return intervals;
    }