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Author: 15-Ab

2024 January/Daily 03-01-24.md

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+## Today's 03-01-24 [Problem Link](https://leetcode.com/problems/number-of-laser-beams-in-a-bank/description/?envType=daily-question&envId=2024-01-03)
+
+
+# Intuition
+<!-- Describe your first thoughts on how to solve this problem. -->
+Basic multiplication.
+# Approach
+<!-- Describe your approach to solving the problem. -->
+- I kept track of number of '1' in a row
+- Now iterated over every row of array 
+- - counted the number of '1' in current row
+- - number of beams will the product of current number of device and previous number of devices
+- -  added the product to answer
+- -  now, the current one will become the previous one to next row
+---
+Have a look at the code , still have any confusion then please let me know in the comments
+Keep Solving.:)
+
+# Complexity
+- Time complexity : $$O(l)$$
+<!-- Add your time complexity here, e.g. $$O(n)$$ -->
+$$l$$ : length of array
+- Space complexity : $$O(1)$$
+<!-- Add your space complexity here, e.g. $$O(n)$$ -->
+
+# Code
+```
+class Solution {
+    public int numberOfBeams(String[] bank) {
+        int jawab = 0;      // to store answer
+        int picheek = 0;    // to store number of '1' in previous state
+
+        for( String r : bank){
+            int ek = (int) r.chars().filter( g -> g == '1').count(); // counting the number of '1' in current row
+            if( ek != 0){             // number of beams will the product of current number of device and previous number of devices
+                jawab += picheek*ek; // adding the product to answer
+                picheek = ek;        // now, the current one will become the previous one to next row
+            }
+        }
+        return jawab;
+    }
+}
+```