规范格式

leetcode/0357.Count-Numbers-with-Unique-Digits/357. Count Numbers with Unique Digits.go

@@ -0,0 +1,25 @@
+package leetcode
+
+// 暴力打表法
+func countNumbersWithUniqueDigits1(n int) int {
+	res := []int{1, 10, 91, 739, 5275, 32491, 168571, 712891, 2345851, 5611771, 8877691}
+	if n >= 10 {
+		return res[10]
+	}
+	return res[n]
+}
+
+// 打表方法
+func countNumbersWithUniqueDigits(n int) int {
+	if n == 0 {
+		return 1
+	}
+	res, uniqueDigits, availableNumber := 10, 9, 9
+	for n > 1 && availableNumber > 0 {
+		uniqueDigits = uniqueDigits * availableNumber
+		res += uniqueDigits
+		availableNumber--
+		n--
+	}
+	return res
+}