题解 | #奶牛喂养时间#

class Solution {
public:
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param intervals int整型vector<vector<>> 
     * @return int整型vector<vector<>>
     */
    vector<vector<int> > mergeTimeIntervals(vector<vector<int> >& intervals) {
        // write code here
        sort(intervals.begin(), intervals.end(), [](const vector<int>& a, const vector<int>& b){
            if (a[0] == b[0]) {
                return a[1] < b[1];
            }
            return a[0] < b[0];
        });
        vector<vector<int>> ans({intervals[0]});
        for (int i = 1; i < intervals.size(); i++) {
            if (intervals[i][0] <= ans.back()[1]) {
                ans.back()[1] = max(intervals[i][1], ans.back()[1]);
            } else {
                ans.push_back(intervals[i]);
            }
        }
        return ans;
    }
};