LeetCode 626: Exchange Seats Solution
Master LeetCode problem 626 (Exchange Seats), a medium 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.
626. Exchange Seats
Problem Explanation
Explanation
To solve this problem, we can use a simple SQL query that swaps the seat id of every two consecutive students. We can achieve this by joining the Seat table with itself, using a self-join operation, where we match the odd seat id with the next even seat id. We then select the desired columns in the required order and sort by the seat id in ascending order.
Algorithm:
- Perform a self-join on the
Seattable to match odd seat ids with the next even seat ids. - Select the columns
idandstudentin the desired order. - Order the result by
idin ascending order.
Time Complexity: O(n) where n is the number of students. Space Complexity: O(1) constant space required for the SQL query execution.
Solution Code
# Write your Java solution here
String sqlQuery = "SELECT CASE WHEN id % 2 = 1 AND id != (SELECT MAX(id) FROM Seat) THEN id + 1 "
+ "WHEN id % 2 = 0 THEN id - 1 ELSE id END AS id, student FROM Seat ORDER BY id;";Try It Yourself
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