LeetCode 2125: Number of Laser Beams in a Bank Solution
Master LeetCode problem 2125 (Number of Laser Beams in a Bank), 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.
Problem Explanation
Explanation:
To solve this problem, we can iterate through each pair of rows containing security devices. For each pair, we check the columns where both rows have security devices and count the number of laser beams that can be formed between them.
- Iterate through all pairs of rows containing security devices.
- For each pair of rows, iterate through the columns to count the number of laser beams that can be formed.
- Count the beams based on the valid conditions mentioned in the problem.
Time Complexity: O(m * n^2), where m is the number of rows and n is the number of columns.
Space Complexity: O(1) as we are not using any extra space.
Solution Code
class Solution {
public int numberOfLaserBeams(String[] bank) {
int count = 0;
int m = bank.length;
int n = bank[0].length();
for (int i = 0; i < m; i++) {
for (int j = i + 1; j < m; j++) {
for (int k = 0; k < n; k++) {
if (bank[i].charAt(k) == '1' && bank[j].charAt(k) == '1') {
for (int r = i + 1; r < j; r++) {
if (bank[r].charAt(k) == '1') {
count--;
break;
}
}
count++;
}
}
}
}
return count;
}
}Try It Yourself
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What is the time complexity of LeetCode 2125 (Number of Laser Beams in a Bank)?
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