171. Excel Sheet Column Number
Given a column title as appear in an Excel sheet, return its corresponding column number.
For example:
A -> 1 B -> 2 C -> 3 ... Z -> 26 AA -> 27 AB -> 28 ...
Example 1:
Input: "A" Output: 1
Example 2:
Input: "AB" Output: 28
Example 3:
Input: "ZY" Output: 701
Constraints:
1 <= s.length <= 7
s
consists only of uppercase English letters.s
is between "A" and "FXSHRXW".
Rust Solution
struct Solution;
impl Solution {
fn title_to_number(s: String) -> i32 {
s.bytes()
.fold(0, |sum, c| sum * 26 + i32::from(c) - 'A' as i32 + 1)
}
}
#[test]
fn test() {
assert_eq!(Solution::title_to_number("A".to_string()), 1);
assert_eq!(Solution::title_to_number("AB".to_string()), 28);
assert_eq!(Solution::title_to_number("ZY".to_string()), 701);
}
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