703125. Find the number of tabs opened
Here is the Markdown blog post for the problem:
Tiger Zinda Hai: Find the number of tabs opened
Summary
In this problem, we are asked to find the total number of tabs opened in a system. Given an array of strings where each string represents a tab opening or closing operation (e.g., "Open" or "Close"), our task is to count the total number of tabs opened. This problem involves arrays and hash data structures.
Detailed Explanation
The approach to this problem is simple yet effective. We iterate through the array of operations, keeping track of the current number of open tabs using a variable open_tabs. Whenever we encounter an "Open" operation, we increment open_tabs, and whenever we encounter a "Close" operation, we decrement it. The final value of open_tabs will represent the total number of tabs opened.
Here is a step-by-step breakdown of the solution:
- Initialize a variable
open_tabsto 0. - Iterate through the array of operations.
- For each operation, check if it's an "Open" or "Close" operation.
- If it's an "Open" operation, increment
open_tabs. - If it's a "Close" operation and
open_tabsis greater than 0, decrementopen_tabs. This ensures that we don't go below 0 (i.e., negative tabs). - Return the final value of
open_tabs.
Time complexity: O(n), where n is the number of operations.
Space complexity: O(1), as we only use a constant amount of space to store the open_tabs variable.
Optimized Solutions
Here are optimized solutions in various programming languages:
Java
public int countOpenTabs(String[] operations) {
int open_tabs = 0;
for (String operation : operations) {
if (operation.equals("Open")) {
open_tabs++;
} else if (open_tabs > 0 && operation.equals("Close")) {
open_tabs--;
}
}
return open_tabs;
}