714215. Wifi Range
Wifi Range
Summary
The problem Wifi Range is an easy-level algorithmic challenge that involves calculating the range of a wifi signal. The given input is a string representing a wifi signal strength, and the task is to determine whether the signal can be received at a certain distance from the source.
Detailed Explanation
To solve this problem, we can use a simple string manipulation approach. The idea is to iterate through the characters in the string and count the number of characters that are greater than or equal to a given threshold (representing the minimum signal strength required for reception).
Here's a step-by-step breakdown of the solution:
- Initialize a variable
rangeto 0, which will store the maximum distance at which the wifi signal can be received. - Iterate through each character in the string from left to right.
- For each character, check if its value is greater than or equal to the minimum signal strength required for reception (let's call this value
threshold). - If a character meets the threshold condition, increment the
rangevariable by 1. - After processing all characters in the string, return the maximum
rangevalue.
Here's an ASCII art diagram illustrating the problem:
+---------------+
| Signal Strength |
| XXXXXXXXXXXX |
| XXXXXXXXXX |
| XXXXXXX |
| X |
+---------------+
Time complexity analysis: O(n), where n is the length of the input string.
Space complexity analysis: O(1), as we only need a single variable to store the maximum range.
Optimized Solutions
Java
public class WifiRange {
public static int wifiRange(String signalStrength) {
int range = 0;
for (char c : signalStrength.toCharArray()) {
if (c >= 'X') { // assume 'X' represents minimum signal strength
range++;
}
}
return range;
}
}