Leetcode/2125

README.md

@@ -227,6 +227,7 @@
 - [1832: Check if the sentence is pangram](problems/leetcode/1832)
 - [1926: Nearest exit from entrance in maze](problems/leetcode/1926)
 - [2095: Delete the middle node of a linked list](problems/leetcode/2095)
+- [2125: Number of laser beams in a bank](problems/leetcode/2125)
 - [2131: Longest palindrome by concatenating two letter words](problems/leetcode/2131)
 - [2225: Find players with zero or one losses](problems/leetcode/2225) - Map
 - [2610: Convert an array into a 2d array with conditions](problems/leetcode/2610) - Medium - Array

problems/leetcode/2125/solution.js

@@ -0,0 +1,29 @@
+const isSecurityDevice = (str) => str === '1';
+
+/**
+ * 
+ * @param {string[]} bank 
+ * @return {number}
+ */
+const numberOfBeams = (bank) => {
+  const rowsWithSecurityDevices = [];
+
+  for (let i = 0; i < bank.length; i++) {
+    let totalDevices = 0;
+    for (let j = 0; j < bank[i].length; j++) {
+      if (isSecurityDevice(bank[i][j])) {
+        totalDevices++;
+      }
+    }
+
+    if (totalDevices > 0) {
+      rowsWithSecurityDevices.push(totalDevices);
+    }
+  }
+
+  return rowsWithSecurityDevices.reduce((acc, devices, i) => {
+    return i + 1 < rowsWithSecurityDevices.length
+      ? acc + devices * rowsWithSecurityDevices[i + 1]
+      : acc
+  }, 0);
+}