<Codesignal> Alphabet Subsequence

Easy

Check whether the given string is a subsequence of the plaintext alphabet.

Example

• For s = "effg", the output should be
  alphabetSubsequence(s) = false;
• For s = "cdce", the output should be
  alphabetSubsequence(s) = false;
• For s = "ace", the output should be
  alphabetSubsequence(s) = true;
• For s = "bxz", the output should be
  alphabetSubsequence(s) = true.

Input/Output

• [execution time limit] 0.5 seconds (c)

• [input] string s

  Guaranteed constraints:
  2 ≤ s.length ≤ 15.

• [output] boolean

  • true if the given string is a subsequence of the alphabet, false otherwise.

[C] Syntax Tips

// Prints help message to the console
// Returns a string
char * helloWorld(char * name) {
    char * answer = malloc(strlen(name) + 8);
    printf("This prints to the console when you Run Tests");
    strcpy(answer, "Hello, ");
    strcat(answer, name);
    return answer;
}

---

Solution

bool alphabetSubsequence(char *s)
{
	for(int i=1;i<strlen(s);i++)
		if(s[i]<=s[i-1])
			return false;
	return true;
}