add JS solution for problem 2306

Author: KwFung7

README.md

@@ -85,7 +85,7 @@ If you would like to have collaborator permissions on the repo to merge your own
 <sub>[2348 - Number of Zero-Filled Subarrays](https://leetcode.com/problems/number-of-zero-filled-subarrays/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](cpp%2F2348-number-of-zero-filled-subarrays.cpp)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](java%2F2348-number-of-zero-filled-subarrays.java)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](kotlin%2F2348-number-of-zero-filled-subarrays.kt)</div></sub> | <sub><div align='center'>[✔️](python%2F2348-number-of-zero-filled-subarrays.py)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
 <sub>[2405 - Optimal Partition of String](https://leetcode.com/problems/optimal-partition-of-string/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](java%2F2405-optimal-partition-of-string.java)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](kotlin%2F2405-optimal-partition-of-string.kt)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
 <sub>[1396 - Design Underground System](https://leetcode.com/problems/design-underground-system/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](java%2F1396-design-underground-system.java)</div></sub> | <sub><div align='center'>[✔️](javascript%2F1396-design-underground-system.js)</div></sub> | <sub><div align='center'>[✔️](kotlin%2F1396-design-underground-system.kt)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
-<sub>[2306 - Naming a Company](https://leetcode.com/problems/naming-a-company/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](java%2F2306-naming-a-company.java)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](kotlin%2F2306-naming-a-company.kt)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
+<sub>[2306 - Naming a Company](https://leetcode.com/problems/naming-a-company/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](java%2F2306-naming-a-company.java)</div></sub> | <sub><div align='center'>[✔️](javascript%2F2306-naming-a-company.js)</div></sub> | <sub><div align='center'>[✔️](kotlin%2F2306-naming-a-company.kt)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub>
 
 ### Two Pointers
 

javascript/2306-naming-a-company.js

@@ -0,0 +1,34 @@
+/**
+ * @param {string[]} ideas
+ * @return {number}
+ */
+var distinctNames = function(ideas) {
+    let sets = [];
+    for (let i = 0; i < 26; i++) {
+        sets[i] = new Set();
+    }
+    for (let s of ideas) {
+        sets[s.charCodeAt(0) - 97].add(s.substring(1));
+    }
+    let same = [];
+    for (let i = 0; i < 26; i++) {
+        same[i] = Array(26).fill(0);
+    }
+    for (let i = 0; i < 26; i++) {
+        for (let s of sets[i]) {
+            for (let j = i + 1; j < 26; j++) {
+                if (sets[j].has(s)) {
+                    same[i][j]++;
+                }
+            }
+        }
+    }
+    let res = 0;
+    for (let i = 0; i < 26; i++) {
+        for (let j = i + 1; j < 26; j++) {
+            res += (sets[i].size - same[i][j]) * (sets[j].size - same[i][j]) * 2;
+        }
+    }
+    return res;
+
+};