Max Points on a Line LeetCode Solution

Problem – Max Points on a Line

Given an array of points where points[i] = [xi, yi] represents a point on the X-Y plane, return the maximum number of points that lie on the same straight line.

Example 1:

Input: points = [[1,1],[2,2],[3,3]]
Output: 3

Example 2:

Input: points = [[1,1],[3,2],[5,3],[4,1],[2,3],[1,4]]
Output: 4

Constraints:

  • 1 <= points.length <= 300
  • points[i].length == 2
  • -104 <= xi, yi <= 104
  • All the points are unique.

Max Points on a Line LeetCode Solution in Java

    public class Solution{
        public int maxPoints(Point[] points) {
        	if (points==null) return 0;
        	if (points.length<=2) return points.length;
        	
        	Map<Integer,Map<Integer,Integer>> map = new HashMap<Integer,Map<Integer,Integer>>();
        	int result=0;
        	for (int i=0;i<points.length;i++){ 
        		map.clear();
        		int overlap=0,max=0;
        		for (int j=i+1;j<points.length;j++){
        			int x=points[j].x-points[i].x;
        			int y=points[j].y-points[i].y;
        			if (x==0&&y==0){
        				overlap++;
        				continue;
        			}
        			int gcd=generateGCD(x,y);
        			if (gcd!=0){
        				x/=gcd;
        				y/=gcd;
        			}
        			
        			if (map.containsKey(x)){
        				if (map.get(x).containsKey(y)){
        					map.get(x).put(y, map.get(x).get(y)+1);
        				}else{
        					map.get(x).put(y, 1);
        				}   					
        			}else{
        				Map<Integer,Integer> m = new HashMap<Integer,Integer>();
        				m.put(y, 1);
        				map.put(x, m);
        			}
        			max=Math.max(max, map.get(x).get(y));
        		}
        		result=Math.max(result, max+overlap+1);
        	}
        	return result;
        	
        	
        }
        private int generateGCD(int a,int b){
    
        	if (b==0) return a;
        	else return generateGCD(b,a%b);
        	
        }
    }

Max Points on a Line LeetCode Solution in C++

int maxPoints(vector<Point> &points) {
    int result = 0;
    for(int i = 0; i < points.size(); i++){
        int samePoint = 1;
        unordered_map<double, int> map;
        for(int j = i + 1; j < points.size(); j++){
            if(points[i].x == points[j].x && points[i].y == points[j].y){
                samePoint++;
            }
            else if(points[i].x == points[j].x){
                map[INT_MAX]++;
            }
            else{
                double slope = double(points[i].y - points[j].y) / double(points[i].x - points[j].x);
                map[slope]++;
            }
        }
        int localMax = 0;
        for(auto it = map.begin(); it != map.end(); it++){
            localMax = max(localMax, it->second);
        }
        localMax += samePoint;
        result = max(result, localMax);
    }
    return result;
}

Max Points on a Line LeetCode Solution in Python

    def maxPoints(self, points):
        l = len(points)
        m = 0
        for i in range(l):
            dic = {'i': 1}
            same = 0
            for j in range(i+1, l):
                tx, ty = points[j].x, points[j].y
                if tx == points[i].x and ty == points[i].y: 
                    same += 1
                    continue
                if points[i].x == tx: slope = 'i'
                else:slope = (points[i].y-ty) * 1.0 /(points[i].x-tx)
                if slope not in dic: dic[slope] = 1
                dic[slope] += 1
            m = max(m, max(dic.values()) + same)
    return m
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