Count Uppercase Letters

Problema

Count how many characters in text are uppercase English letters A–Z.

Implement count_uppercase(text).

text: The text to inspect.

Return the number of uppercase letters.

0 ≤ length of text ≤ 10,000 (ASCII characters)

Esempio 1

Input:
text = "Hello World"

Output atteso:
expected = 2

Input:
std::string text = "Hello World";

Output atteso:
long long expected = 2;

Input:
string text = "Hello World";

Output atteso:
long expected = 2;

H and W are uppercase: 2.

Esempio 2

Input:
text = "no caps here!"

Output atteso:
expected = 0

Input:
std::string text = "no caps here!";

Output atteso:
long long expected = 0;

Input:
string text = "no caps here!";

Output atteso:
long expected = 0;

There are no uppercase letters: 0.

Prova prima da solo, poi apri un suggerimento alla volta.

Suggerimento 1

Scan the text once and notice only letters A through Z count.

Suggerimento 2

Check each character’s case directly instead of comparing against words or splitting the string.

Suggerimento 3

Remember lowercase letters, digits, spaces, and punctuation do not contribute.

Complessità attesa

O(n) time, O(1) extra space

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