149. 直线上最多的点数/C++

最新推荐文章于 2024-06-23 00:24:50 发布

Lambda_eta

最新推荐文章于 2024-06-23 00:24:50 发布

阅读量524

点赞数 1

分类专栏： LeetCode/C++

本文链接：https://blog.youkuaiyun.com/Zolewit/article/details/98485375

版权

LeetCode/C++ 专栏收录该内容

248 篇文章

订阅专栏

在这里插入图片描述

class Solution {
    int gcd(int y,int x){
        return x==0?y:gcd(x,y%x);
    }
public:
    int maxPoints(vector<vector<int>>& points) {
        int n = points.size();
        if(n<=2) return n;
        int res = 0;
        for(int i=0;i<n-1;++i){
            unordered_map<string,int> map;
            int repeat = 0;
            int maxOnePoint = 0;
            for(int j=i+1;j<n;++j){
                int deltaY = points[i][1]-points[j][1];
                int deltaX = points[i][0]-points[j][0];
                
                if(deltaY==0 && deltaX==0){
                    ++repeat;
                    continue;
                }
                
                int g = gcd(deltaY,deltaX);
                deltaY /= g;
                deltaX /= g;

                string slope = to_string(deltaY)+"/"+to_string(deltaX);
                ++map[slope];
                maxOnePoint = max(maxOnePoint,map[slope]);
            }
            res = max(res,repeat+maxOnePoint+1);
        }
        return res;
    }
};