LeetCode 2848: Points That Intersect With Cars Solution
Master LeetCode problem 2848 (Points That Intersect With Cars), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.
2848. Points That Intersect With Cars
Problem Explanation
Explanation
To solve this problem, we can iterate through each car's range and mark the points on the number line that are covered by any car. We can do this by maintaining an array of size 101 (as the constraints state that the range of points can be from 1 to 100). For each car's range [starti, endi], we mark all the points from starti to endi (inclusive) in the array. Finally, we count the number of marked points in the array.
- Time complexity: O(n), where n is the number of cars.
- Space complexity: O(1) since the array size is constant.
Solution Code
class Solution {
public int intersectingPoints(int[][] nums) {
int[] points = new int[101];
for (int[] car : nums) {
for (int i = car[0]; i <= car[1]; i++) {
points[i] = 1;
}
}
int count = 0;
for (int point : points) {
if (point == 1) {
count++;
}
}
return count;
}
}Try It Yourself
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