2582. Pass the Pillow

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Hint

There are n people standing in a line labeled from 1 to n. The first person in the line is holding a pillow initially. Every second, the person holding the pillow passes it to the next person standing in the line. Once the pillow reaches the end of the line, the direction changes, and people continue passing the pillow in the opposite direction.

• For example, once the pillow reaches the nth person they pass it to the n - 1th person, then to the n - 2th person and so on.

Given the two positive integers n and time, return the index of the person holding the pillow after time seconds.

Example 1:

Input: n = 4, time = 5
Output: 2
Explanation: People pass the pillow in the following way: 1 -> 2 -> 3 -> 4 -> 3 -> 2.
After five seconds, the 2nd person is holding the pillow.

Example 2:

Input: n = 3, time = 2
Output: 3
Explanation: People pass the pillow in the following way: 1 -> 2 -> 3.
After two seconds, the 3rd person is holding the pillow.

Constraints:

• 2 <= n <= 1000
• 1 <= time <= 1000

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Accepted

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Submissions

131.2K

Acceptance Rate

52.4%

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Hint 1

Hint 2

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Discussion (80)

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Note : use the time to simulate the situation , while time decreases initialize the pass number person who is currently serving the pillow pass, use the direction to which person he has to serve the pass to.

the pillow can be passed to only one person, either right person or left person. so the unit is 1 or -1 it is dicided weather the person is first and pass came from left or right .

class Solution {

    /** T : O(Time) S: O(1) */
    public int passThePillow(int n, int time) {
        
        int pass=1, direction=0;
        while (time-- > 0){
            if( pass==1 ) direction=1;
            else if( pass ==n) direction =-1;
            pass+=direction;
    
        }
        return pass;
    }
}

/**

2582. Pass the Pillow
Solved
Easy
Topics
Companies
Hint
There are n people standing in a line labeled from 1 to n. The first person in the line is holding a pillow initially. Every second, the person holding the pillow passes it to the next person standing in the line. Once the pillow reaches the end of the line, the direction changes, and people continue passing the pillow in the opposite direction.

For example, once the pillow reaches the nth person they pass it to the n - 1th person, then to the n - 2th person and so on.
Given the two positive integers n and time, return the index of the person holding the pillow after time seconds.

 

Example 1:

Input: n = 4, time = 5
Output: 2
Explanation: People pass the pillow in the following way: 1 -> 2 -> 3 -> 4 -> 3 -> 2.
After five seconds, the 2nd person is holding the pillow.
Example 2:

Input: n = 3, time = 2
Output: 3
Explanation: People pass the pillow in the following way: 1 -> 2 -> 3.
After two seconds, the 3rd person is holding the pillow.

Constraints:

2 <= n <= 1000
1 <= time <= 1000
Seen this question in a real interview before?
1/5
Yes
No
Accepted
81.9K
Submissions
153.3K
Acceptance Rate
53.4%
Topics
Companies
Hint 1
Maintain two integer variables, direction and i, where direction denotes the current direction in which the pillow should pass, and i denotes an index of the person holding the pillow.
Hint 2
Similar Questions
Discussion (100)
 */