leetcode-go/easy/171.go

package main

import (
	"fmt"
)

func titleToNumber(s string) int {
	res := 0
	for base, i := 1, len(s)-1; i >= 0; base, i = base*26, i-1 {
		res += base * int(s[i]-'A'+1)
	}
	return res
}

func main() {
	fmt.Println(titleToNumber("WV"))
}