15 lines
396 B
Rust
15 lines
396 B
Rust
pub fn str_str(haystack: String, needle: String) -> i32 {
|
|
if needle.is_empty() {
|
|
return 0;
|
|
}
|
|
|
|
haystack.find(&needle).map(|n| n as i32).unwrap_or(-1)
|
|
}
|
|
|
|
#[test]
|
|
fn test_implement_strstr() {
|
|
assert_eq!(str_str("hello".to_string(), "ll".to_string()), 2);
|
|
assert_eq!(str_str("aaaaa".to_string(), "bba".to_string()), -1);
|
|
assert_eq!(str_str("aaaaa".to_string(), "".to_string()), 0);
|
|
}
|