Update 2376-count-special-integers.js

Author: everthis

2376-count-special-integers.js

@@ -58,3 +58,59 @@ const countSpecialNumbers = function (n) {
     return (dp[idx][tight][mask] = ans)
   }
 }
+
+// another
+
+const dp = Array.from({ length: 11 }, () =>
+  Array.from({ length: 2 }, () => Array(1024).fill(-1)),
+)
+
+function gogo(s, tight = 1, pos = 0, mask = 0) {
+  // Base case
+  if (pos === s.length) {
+    // Mask = 0, represents 00000...0 which should not be counted
+    return mask !== 0
+  }
+
+  // DP state
+  if (dp[pos][tight][mask] !== -1) {
+    return dp[pos][tight][mask]
+  }
+
+  let ans = 0
+
+  if (tight === 1) {
+    // Limit the current digit
+    for (let i = 0; i <= s[pos] - '0'; i++) {
+      // Check if digit repeated, ie, present in the mask
+      if (mask & (1 << i)) continue
+
+      const newMask = mask === 0 && i === 0 ? mask : mask | (1 << i)
+
+      if (i === s[pos] - '0') {
+        // Tight case
+        ans += gogo(s, 1, pos + 1, newMask)
+      } else {
+        ans += gogo(s, 0, pos + 1, newMask)
+      }
+    }
+  } else {
+    for (let i = 0; i <= 9; i++) {
+      // Check if digit repeated, ie, present in the mask
+      if (mask & (1 << i)) continue
+
+      const newMask = mask === 0 && i === 0 ? mask : mask | (1 << i)
+      ans += gogo(s, 0, pos + 1, newMask)
+    }
+  }
+  return (dp[pos][tight][mask] = ans)
+}
+/**
+ * @param {number} n
+ * @return {number}
+ */
+var countSpecialNumbers = function (n) {
+  const s = n.toString()
+  dp.forEach((arr) => arr.forEach((innerArr) => innerArr.fill(-1)))
+  return gogo(s)
+}