First Unique Character

Return the index of the first character in text that appears exactly once. Case matters.

Implement first_unique_index(text).

Input

text: The text to inspect.

Output

Return the index, or -1 if every character repeats.

Vincoli

0 ≤ length ≤ 100,000

Esempi

Input:
text = "swiss"

Output atteso:
expected = 1

Input:
std::string text = "swiss";

Output atteso:
long long expected = 1;

Input:
string text = "swiss";

Output atteso:
long expected = 1;

Input:
text = "aabb"

Output atteso:
expected = -1

Input:
std::string text = "aabb";

Output atteso:
long long expected = -1;

Input:
string text = "aabb";

Output atteso:
long expected = -1;

Riferimenti

Questa sfida è adattata per CodeUtility. Segui la traccia e i vincoli sopra.

• GWU CS1111 Introduction to Software Development - lab sequence