leetcode 56 Merge Intervals leetcode 57 Insert Interval 區間合併

leetcode 56 Merge Intervals

https://leetcode.com/problems/merge-intervals/

class Solution {
public:
    vector<vector<int>> merge(vector<vector<int>>& intervals) {
        vector<vector<int>> result;
        int n = intervals.size();
        if(n<=1) return intervals;
        result.push_back(intervals[0]);
        int i = 1;
        for(i=1;i<n;i++){
            result = insert(result, intervals[i]);
        }
        return result;
    }
    
    vector<vector<int>> insert(vector<vector<int>>& set, vector<int> single){
        int i=0;
        int n=set.size();
        vector<vector<int>> result;
        while(i<n && set[i][1]<single[0] ){//無交集
            result.push_back(set[i]);
            i++;
        }
        while(i<n && set[i][0] <=single[1]){//有交集  到此,說明set[i][1]>= single[0],只要set[i][0] <=single[1]就能保證有交集
            int l = min(set[i][0], single[0]);
            int r = max(set[i][1], single[1]);
            single[0]= l;
            single[1]= r;
            i++;
        }
        result.push_back(single);
        while(i<n){
            result.push_back(set[i]);
            i++;
        }
        return result;
    }
};

 

leetcode 57 Insert Interval

https://leetcode.com/problems/insert-interval/

class Solution {
public:
    vector<vector<int>> insert(vector<vector<int>>& intervals, vector<int>& newInterval) {
        int n = intervals.size();
        int i=0;
        vector<vector<int>> result;
        while(i<n && intervals[i][1]<newInterval[0]){//無交集
            result.push_back(intervals[i]);
            i++;
        }
        while(i<n && intervals[i][0] <= newInterval[1]){  //有交集  到此,說明intervals[i][1]>=newInterval[0],只要intervals[i][0] <= newInterval[1]就能保證有交集
            newInterval[0] = min(intervals[i][0], newInterval[0]);
            newInterval[1] = max(intervals[i][1], newInterval[1]);
            i++;
        }
        result.push_back(newInterval);
        while(i<n){
            result.push_back(intervals[i]);
            i++;
        }
        return result;
    }
};

 

發表評論
所有評論
還沒有人評論,想成為第一個評論的人麼? 請在上方評論欄輸入並且點擊發布.
相關文章