Create 1399-count-largest-group.js

Author: everthis

1399-count-largest-group.js

@@ -0,0 +1,21 @@
+/**
+ * @param {number} n
+ * @return {number}
+ */
+const countLargestGroup = function(n) {
+  const hash = {}
+  const sum = n => `${n}`.split('').reduce((ac, e) => ac + (+e), 0)
+  for(let i = 1; i <= n; i++) {
+    const tmp = sum(i)
+    if(hash[tmp] == null) hash[tmp] = 0
+    hash[tmp]++
+  }
+  // console.log(hash)
+  const val = Math.max(...Object.values(hash))
+  let res = 0
+  Object.keys(hash).forEach(k => {
+    if(hash[k] === val) res++
+  })
+  
+  return res
+};