添加 18 题

leetcode/0168.Excel-Sheet-Column-Title/168. Excel Sheet Column Title.go

@@ -0,0 +1,13 @@
+package leetcode
+
+func convertToTitle(n int) string {
+	result := []byte{}
+	for n > 0 {
+		result = append(result, 'A'+byte((n-1)%26))
+		n = (n - 1) / 26
+	}
+	for i, j := 0, len(result)-1; i < j; i, j = i+1, j-1 {
+		result[i], result[j] = result[j], result[i]
+	}
+	return string(result)
+}

leetcode/0168.Excel-Sheet-Column-Title/168. Excel Sheet Column Title_test.go

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+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question168 struct {
+	para168
+	ans168
+}
+
+// para 是参数
+// one 代表第一个参数
+type para168 struct {
+	n int
+}
+
+// ans 是答案
+// one 代表第一个答案
+type ans168 struct {
+	one string
+}
+
+func Test_Problem168(t *testing.T) {
+
+	qs := []question168{
+
+		question168{
+			para168{1},
+			ans168{"A"},
+		},
+
+		question168{
+			para168{28},
+			ans168{"AB"},
+		},
+
+		question168{
+			para168{701},
+			ans168{"ZY"},
+		},
+
+		question168{
+			para168{10011},
+			ans168{"NUA"},
+		},
+
+		question168{
+			para168{999},
+			ans168{"ALK"},
+		},
+
+		question168{
+			para168{681},
+			ans168{"ZE"},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 168------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans168, q.para168
+		fmt.Printf("【input】:%v    【output】:%v\n", p, convertToTitle(p.n))
+	}
+	fmt.Printf("\n\n\n")
+}

leetcode/0168.Excel-Sheet-Column-Title/README.md

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+# [168. Excel Sheet Column Title](https://leetcode.com/problems/excel-sheet-column-title/)
+
+## 题目
+
+Given a positive integer, return its corresponding column title as appear in an Excel sheet.
+
+For example:
+
+```
+		1 -> A
+    2 -> B
+    3 -> C
+    ...
+    26 -> Z
+    27 -> AA
+    28 -> AB 
+    ...
+```
+
+**Example 1**:
+
+```
+Input: 1
+Output: "A"
+```
+
+**Example 2**:
+
+```
+Input: 28
+Output: "AB"
+```
+
+**Example 3**:
+
+```
+Input: 701
+Output: "ZY"
+```
+
+## 题目大意
+
+给定一个正整数，返回它在 Excel 表中相对应的列名称。
+
+例如，
+
+    1 -> A
+    2 -> B
+    3 -> C
+    ...
+    26 -> Z
+    27 -> AA
+    28 -> AB 
+    ...
+
+
+## 解题思路
+
+- 给定一个正整数，返回它在 Excel 表中的对应的列名称
+- 简单题。这一题就类似短除法的计算过程。以 26 进制的字母编码。按照短除法先除，然后余数逆序输出即可。
+
+## 代码
+
+```go
+
+package leetcode
+
+func convertToTitle(n int) string {
+	result := []byte{}
+	for n > 0 {
+		result = append(result, 'A'+byte((n-1)%26))
+		n = (n - 1) / 26
+	}
+	for i, j := 0, len(result)-1; i < j; i, j = i+1, j-1 {
+		result[i], result[j] = result[j], result[i]
+	}
+	return string(result)
+}
+
+```