Create 2081-sum-of-k-mirror-numbers.js

Author: everthis

2081-sum-of-k-mirror-numbers.js

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+const isPalindrome = (s) => { let n = s.length; let i = 0; let j = n - 1; while (i < j) { if (s[i++] != s[j--]) return false; } return true; };
+
+const int = parseInt;
+/**
+ * @param {number} k
+ * @param {number} n
+ * @return {number}
+ */
+var kMirror = function(k, n) {
+    let res = 0;
+    for (let len = 1; ; len++) {
+        let min = 10 ** ((len - 1) >> 1), max = 10 ** ((len + 1) >> 1);
+        for (let base = min; base < max; base++) {
+            let x = base;
+            for (let i = len & 1 ? int(base / 10) : base; i > 0; i = int(i / 10)) {
+                x = x * 10 + i % 10;
+            }
+            let s = x.toString(k);
+            if (isPalindrome(s)) {
+                res += x;
+                n--;
+                if (!n) return res;
+            }
+        }
+    }  
+};