Create 1309-decrypt-string-from-alphabet-to-integer-mapping.js

Author: everthis

1309-decrypt-string-from-alphabet-to-integer-mapping.js

@@ -0,0 +1,32 @@
+/**
+ * @param {string} s
+ * @return {string}
+ */
+const freqAlphabets = function(s) {
+  const n = s.length, a = 'a'.charCodeAt(0) - 1
+  let res = '', cur = '', num = 0
+
+  for(let i = n - 1; i >= 0; i--) {
+    const ch = s[i]
+    if(cur === '') {
+      if(ch === '#') {
+        cur = ch
+        num = 0
+      } else{
+        res = (String.fromCharCode(a + (+ch))) + res
+      }
+    } else {
+      if (num < 1) {
+        cur = ch + cur
+        num++
+      } else {
+        cur = ch + cur
+        const tmp = cur.slice(0,cur.length - 1)
+        res = (String.fromCharCode(a + (+tmp))) + res
+        cur = ''
+        num = 0
+      }
+    }
+  }
+  return res
+};