题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
//和上一个题一样 但不用反转
use std::io::{self, *};
fn main() {
let mut s = String::new();
std::io::stdin().read_line(&mut s).unwrap();
let mut res = String::new();
for c in s.trim().chars() {
if !res.contains(c) {
res.push(c)
}
}
println!("{}", res.len());
}
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