713143. Last modified ball
Easy
Last Modified Ball
Summary
Given a sequence of balls, each with its own modification time, find the ball that has been modified most recently. In this problem, we are asked to identify the last modified ball in a given sequence.
Detailed Explanation
To solve this problem, we can iterate through the sequence and keep track of the maximum modification time seen so far. When we encounter a new ball with a modification time greater than our current maximum, we update our maximum.
Here's a step-by-step breakdown:
- Initialize
max_timeto 0. - Iterate through the sequence of balls:
- For each ball, check if its modification time is greater than
max_time. - If it is, update
max_timeto be the current ball's modification time.
- For each ball, check if its modification time is greater than
- The last modified ball is the one with the maximum modification time.
Time complexity: O(n), where n is the number of balls in the sequence. We need to iterate through each ball once.
Space complexity: O(1), as we only use a constant amount of space to store max_time.
Optimized Solutions
Java
public class LastModifiedBall {
public static Ball findLastModified(Ball[] balls) {
int maxTime = 0;
Ball lastModified = null;
for (Ball ball : balls) {
if (ball.getModificationTime() > maxTime) {
maxTime = ball.getModificationTime();
lastModified = ball;
}
}
return lastModified;
}
}