Add excel-sheet-column-title

Author: tinycedar

excel-sheet-column-title.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"fmt"
+)
+
+func convertToTitle(n int) string {
+	m := make(map[int]rune)
+	for i := 0; i < 26; i++ {
+		m[i+1] = rune('A' + i)
+	}
+	slice := []rune{}
+	if n <= 26 {
+		return string(m[n])
+	}
+	for ; n > 0; n /= 26 {
+		if n%26 == 0 {
+			slice = append(slice, m[26])
+			n -= 26
+			for n > 0 && n <= 26 {
+				n /= 26
+				if n > 0 {
+					slice = append(slice, m[n])
+				}
+			}
+		} else {
+			slice = append(slice, m[n%26])
+		}
+	}
+
+	sliceLen := len(slice)
+	for i, j := 0, sliceLen-1; i < j; i, j = i+1, j-1 {
+		slice[i], slice[j] = slice[j], slice[i]
+	}
+	return string(slice)
+}
+
+func main() {
+	// fmt.Println("26= ", convertToTitle(26))
+	// fmt.Println("27= ", convertToTitle(27))
+	// fmt.Println("28= ", convertToTitle(28))
+	// fmt.Println("52= ", convertToTitle(52))
+	// fmt.Println("701= ", convertToTitle(701))
+	fmt.Println("702= ", convertToTitle(702))
+}